GTA
Airguns by Make and Model => Crosman Airguns => Topic started by: Hoosier Daddy on January 08, 2017, 10:21:46 AM
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With these long cold winter nights, I am dreaming of my next build.
I REALLY like my 2300KT in .22. And am digging the accuracy of my assorted .177's shooting indoors.
So that got me thinking of building a 1740.
As a starter... I have a 10.1" barrel and 177 bolt I took off my 1377 laying here collecting dust. If I were to buy a bone stock 2240, put that barrel on and bolt in the plastic breech to make a 1740, is it fair to say it is going to be more accurate all other things being equal?
Yes... mods are definitely in the future... but this time will be more towards accuracy, not power. I have learned you don't need blistering speed to be a tack-driver.
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Oh yeah, light that wallet up. That should keep you warm for few days. ;)
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you'll also need a smaller t-port. the one in the 2240 is way too large for.177. you'll be wasting a lot of gas. a lighter hammer spring wouldn't hurt, either.
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I did the very same thing,sweet little gun..., buddy liked it so much he traded me an old mossberg pump for it.....and I turned around an got a 2300KT in 177 .....good luck
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Ive done it before. Actually planning on doing it again. Find a UK or CAD Transfer port from a 1377. Its like .089.
Being primary indoors. I lowered the FPS and I was able to get over 140 shots from 1 Co2.
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Oh yeah, light that wallet up. That should keep you warm for few days. ;)
BWA-HA-HAAA!
You know me too well Sister! BUT... I got Christmas gift cards burning a hole in my wallet now.
Good to know about the TP.. Little at a time I keep telling myself. A power adjuster and a steel breech would but next.
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Having modded many 2240's in .22 & .177.
After looking back hard on what I liked and disliked about each of them, I Made this one with the things I liked about each of them.
.177, 10 inch barrel, TKO, rear velocity adjuster, lighter hammer, P-rod trigger group, and a 3moa red/green dot.
The perfect pesting and plinker gun, crank the velocity up to right at 600 fps with 7.9gr pellets for pest,
or crank it down to 375 fps with wadcutters and over 100 shots per cartridge for poking holes in paper and soda cans.
Of all my pistols, it is the most versatile.
(http://i66.tinypic.com/24ecf95.jpg)
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Nice looking pistol Ian :D
Who's sight are you using? I have a Barska that I use occasionally on my pistols and the red dot isn't the best...
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A 1740 was my winter project last year. As far as being more accurate, I would say it depends on the barrel. I decided to go with Crosman's 10.1" .177 Lothar Walther.
I took the stock 2240 I used in Bob Sterne's 2240 Leap Year SSG challenge last winter and added a steel breech from the parts bin, an extended probe bolt, and the LW barrel to make a sweet target shooter.
(http://i1305.photobucket.com/albums/s543/timbyb/IMG_0613_zpsjisytu8h.jpg) (http://s1305.photobucket.com/user/timbyb/media/IMG_0613_zpsjisytu8h.jpg.html)
Blue
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Yep. it's a brilliant conversion, I have one.... You don't need to change the porting, just shorten the hammer spring until the velocity just starts to drop.... You'll save at least half the CO2 and still have the same power....
Bob
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Ian: You read my mind almost to a "T"...
Where did you get that power adjuster? I have seen it somewhere but can't find it now...I was going to get an aluminum one from Davio at Alchemy.
I have a TKO and a BSA Red Dot on my 2300KT and love it.
I already have other bobbles here, am working on an air stripper for a Crosman sized barrel from bits I have from work...
First things first, I need to get the gun then I can start.
Blue: Darn nice one there!
You don't need to change the porting, just shorten the hammer spring until the velocity just starts to drop.... You'll save at least half the CO2 and still have the same power....
Thanks Bob!
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The power adjuster is from a crosman challenger.
The dot is a Chinese one with a small (3-4 moa) very nice clear dot, no blooming or smearing.
https://www.amazon.com/Field-Sport-Green-Micro-Sight/dp/B00D4AYBR6 (https://www.amazon.com/Field-Sport-Green-Micro-Sight/dp/B00D4AYBR6)
And I use this adapter to keep the sight low, it fits into the sights mount, and stays there.
https://leapers.com/prod_detail.php?mitem=Mounting%20Systems&itemno=MNT-DT2PW01 (https://leapers.com/prod_detail.php?mitem=Mounting%20Systems&itemno=MNT-DT2PW01)
It's very quiet, and very accurate.
It's a crosman barrel, but it's been polished and crowned.
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why not just skip buying the gun and buy parts to assemble. in the end alot of the stock parts will just end up in the parts bin, un-used. i figured that out after my first co2 build and i had kept next to nothing. there are so many ways to go with this platform.
whatever you decide have fun
peace
kj
ps..don cothran has nice stainlesss power adjusters, tubes , trigger blades etc
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why not just skip buying the gun and buy parts to assemble. in the end alot of the stock parts will just end up in the parts bin, un-used. i figured that out after my first co2 build and i had kept next to nothing. there are so many ways to go with this platform.
Well how else are you supposed to end up with a box of LEGOS, I mean spare parts, to inspire the next build? ;)
Blue
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If you keep buying stock 2240's and building from there, you end up wit a lot of duplicate parts in the spares bin.
Several plastic breeches,bolt probes that are too short, standard barrels, front and rear sights.
This photo shows the importance of an extended bolt probe.
The factory probe seats the skirt right over the transfer port.
(http://i41.tinypic.com/t64idk.jpg)
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I really thought about buying a 1701 trigger group and building it from scratch... Or taking my on advise I have given here and picking up a 2300KT / 2400KT from the Crosman custom shop built the way I want it and be way ahead from the Get-go.
But I chose this route because of Amazon gift cards I got for Christmas so essentially I can do a lot for "Free".
Also, I can shoot it now and see how my mods effect the performance. Left over parts is all part of the game to me. Blue is right, those left over parts are what got me thinking about this build. ;)
Don Cothran has some nice SS stuff for good prices. THANKS!
I do like how sleek that Challenger power adjuster looks, I wish Crosman listed prices in their online parts lists.
You're right Ian, the extended probe is a necessity. I already have one saved in 3 different shopping carts for when I get a steel Breech.
That Picatinny adapter is SLICK!
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i understand spending up the amazon cards.lol i found from the original 2240 i never used the left over parts, just gave them away. the idea of seeing what each mod does ia valid though. here is the best pick i had of cothrans power adjuster. he has also made me parts in brass and aluminum.
(http://i1281.photobucket.com/albums/a505/bbb151/013_zpsajuokgby.jpg) (http://s1281.photobucket.com/user/bbb151/media/013_zpsajuokgby.jpg.html)
peace
kj
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I keep trying to ignore the spare parts when they whisper about what they could be, I really do!!!
This year I had enough leftovers from builds/upgrades to split a previous project into 2 "new" guns. I needed to buy a few parts I didn't have for the "upgrade" but then had enough "leftovers" for the new build.
After I got the parts, I realized I mistakenly ordered two different steel breeches. This actually saved me some time as the one I ordered by mistake was the one I needed so the one I THOUGHT was right now awaits its future in with the other parts.
Now I'm back in the same boat, a bin with enough parts to almost be something! I can hear them talking about it even now!
Blue
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Like all crosman parts, the adjuster is priced low, much lower than others, because they make them by the tens of thousands..
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Yesterday I blew the Christmas Amazon gift cards and bought a 2240. Coming from seller PA... $3 less than the Amazon Prime free shipping one that comes up without digging.
Today at lunch I called Crosman with my wish list of parts for price and availability... while it was a buzz kill on the old 392P part numbers being obsolete, the parts for this build was OUT-FRIGGIN-STANDING!
You can get the 177 steel breech kit for < $35 and that Challenger power adjuster for $14... plus all the rest came to $56...
Need to add more and call in the order!
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I picked up a 10.1 1377 barrel today and now I just need a bolt. I installed the breech from my maximus on my 2240.
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PLEASE keep us posted here on your build Robert!
I was torn between keeping this one going with my build, or starting a new one once the parts start showing up.
But if we can get a community thread going on the 1740 vs 2240 I will gladly post my progress here.
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PLEASE keep us posted here on your build Robert!
I was torn between keeping this one going with my build, or starting a new one once the parts start showing up.
But if we can get a community thread going on the 1740 vs 2240 I will gladly post my progress here.
Yeah I bought a 2240 multi shot breech that I put on my Maximus. I got the crosman parts pile. so I just put the maximus steel breech onto the 2240. It just doesn't have rear sights.
It pretty much looks like blues, minus the grips are black, no rear sight, and no TKO. But same reddot.
Im just ordering a Disco 177 probe being that theyre extended and well already got the handle.
The RVA I got is the modified 2300 that I drilled out for 3/8-16 that I just put in a bolt.
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Since we are comparing 1740 to 2240 (17 vs 22) you should watch this video.
Even though it's done with rifles the correlation between .22 & .177 is what we are looking at.
The results are surprising.
https://youtube.com/watch?v=cyTZGOMSMUk (https://youtube.com/watch?v=cyTZGOMSMUk)
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Ian,
Thanks for the link, that was really good you tube video! :D
PS, I saved the red dot scope info from your earlier post for future purchases.
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This is the one that is going on my next build, it's the same size micro dot, but has a built in laser.
And a 3 Moa dot.
I handled one at a gun show the other day, and was impressed with it, but didn't want to pay the sellers $99 price tag.
http://shop.opticsplanet.com/vism-micro-greendot-laser-sight-w-integrated-red-laser-vdgrlb.html?_iv_code=K2-LS-GDLS-VDGRLB&utm_source=google&utm_medium=cpc&utm_campaign=plusbox-beta&gclid=CIHinaatudECFQgOaQod6boOPw (http://shop.opticsplanet.com/vism-micro-greendot-laser-sight-w-integrated-red-laser-vdgrlb.html?_iv_code=K2-LS-GDLS-VDGRLB&utm_source=google&utm_medium=cpc&utm_campaign=plusbox-beta&gclid=CIHinaatudECFQgOaQod6boOPw)
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That 177 vs 22 video was very well done.
It does make sense if you think physics of inertia. Things in motion tend to stay in motion and the higher the mass the more the effect.
Cool stuff
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This is the one that is going on my next build, it's the same size micro dot, but has a built in laser.
And a 3 Moa dot.
I handled one at a gun show the other day, and was impressed with it, but didn't want to pay the sellers $99 price tag.
http://shop.opticsplanet.com/vism-micro-greendot-laser-sight-w-integrated-red-laser-vdgrlb.html?_iv_code=K2-LS-GDLS-VDGRLB&utm_source=google&utm_medium=cpc&utm_campaign=plusbox-beta&gclid=CIHinaatudECFQgOaQod6boOPw (http://shop.opticsplanet.com/vism-micro-greendot-laser-sight-w-integrated-red-laser-vdgrlb.html?_iv_code=K2-LS-GDLS-VDGRLB&utm_source=google&utm_medium=cpc&utm_campaign=plusbox-beta&gclid=CIHinaatudECFQgOaQod6boOPw)
Price dropped down to 59.99 so it is 40% off right now.
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I already ordered one, it should be here Friday.
I looked it up while at the gunshow, the gun show dealer wanted $99 plus tax.
I wasn't going to pay his price.
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My starting point 2240 arrived Friday just in time for the weekend.
Yesterday between commitments I touched up the crown on the "hand-me-down" 1377 barrel and polished the lead-in on the breech end of it... ran a dozen or so Q-tips wet and dry down the bore. It only had about 100 shots through it before it was replaced so it is hardly "broke in".
This morning dug out my tools and other .177 bolt then made the change over.
Brand new, the transfer port seal was out of position and partially blocking the port. Flipped the seal over and it lined right back up. Fitted my DIY air stripper, put in the first CO2 cart and test fired. Nice blast of air out both sides of the stripper so I know it works, at least some. :D
Actually was able to take it outside and sight it in with about 1/2 dozen shots, shoot twice, come in and adjust let warm up and repeat... using the factory rear blade. Now she can hit a nickel at 10M so I am now confident to continue shooting her inside with the indoor trap.
(http://i1327.photobucket.com/albums/u670/Hoosierb17/Hobbies/IMG_20170115_181201672_BURST000_COVER_TOP2_zpsor1c9neo.jpg)
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looks good so far. nice to get good barrel. now you started down that slippery slope. lol
have fun
kj
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If you keep buying stock 2240's and building from there, you end up wit a lot of duplicate parts in the spares bin.
Several plastic breeches,bolt probes that are too short, standard barrels, front and rear sights.
This photo shows the importance of an extended bolt probe.
The factory probe seats the skirt right over the transfer port.
(http://i41.tinypic.com/t64idk.jpg)
Lurking. Forgive my ignorance.
Can going to a larger head size make up some of the difference of having to short a bolt probe? Thanks.
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With the pellet in the position shown, if you are shooting soft pure lead pellets (jsb's )
The high pressure air blast COULD Deform the skirt.
Also, if it's seated farther, the head and skirt have started to engage the rifling, and is a much cleaner air flow to the back of the pellet.
As to a larger head size making a difference, I don't know.
Never looked into that aspect of it.
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If you keep buying stock 2240's and building from there, you end up wit a lot of duplicate parts in the spares bin.
Several plastic breeches,bolt probes that are too short, standard barrels, front and rear sights.
This photo shows the importance of an extended bolt probe.
The factory probe seats the skirt right over the transfer port.
(http://i41.tinypic.com/t64idk.jpg)
Lurking. Forgive my ignorance.
Can going to a larger head size make up some of the difference of having to short a bolt probe? Thanks.
i can't see that a larger head size would move it further into the barrel leade. the idea is to get the skirt up in there so it doesn't get damaged . and like was mentioned it will give a better flow to the back of the pellet.
peace
kj
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If you keep buying stock 2240's and building from there, you end up wit a lot of duplicate parts in the spares bin.
Several plastic breeches,bolt probes that are too short, standard barrels, front and rear sights.
This photo shows the importance of an extended bolt probe.
The factory probe seats the skirt right over the transfer port.
(http://i41.tinypic.com/t64idk.jpg)
Lurking. Forgive my ignorance.
Can going to a larger head size make up some of the difference of having to short a bolt probe? Thanks.
i can't see that a larger head size would move it further into the barrel leade. the idea is to get the skirt up in there so it doesn't get damaged . and like was mentioned it will give a better flow to the back of the pellet.
peace
kj
Yes, the pellet should be pushed all the way past that hole. What I was intending was having the head help seal the pressure, like having 2 skirts.
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Ideally, you want the head diameter to be just a smidgen larger than the bore diameter.
1. It seals better.
2. It engages the rifling better.
3. The pellet is supported at both ends while in the barrel.
That's why pellet manufacturers (some of them) put the head sizes on the bottom of the tins.
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Those that have done the conversion, ever switch back and forth to .22? Currently building my 2240 into what I want, toying with the idea of being able to swap back and forth (not all the time mind you) but I figured the porting on the .22 would be too much for the .177; however, with Bob's comment about just backing off the hammer strike to the knee of the .177 leads me to believe this could very well be an easy swap, especially with having a mostly internal SSG. Could literally leave one spring sub-assembly set up for .177 and another set up for .22. Would take about 5 minutes to swap over.
Seems like for about $25 I could pick up a .177 10" barrel and convert one of my spare bolts to an extended probe .177 for a fairly cheap 2 caliber plinker; everyone's comments on how sweet this is in .177 is making think about it even more.... :-\
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Interested in hearing the replies as well.
I am thinking once a Power Adjuster is installed, a barrel and bolt (probe) swap for each caliber is about all the more one would have to do.
Granted you could "fine tune" with assorted internals for a gun dedicated to a specific caliber.
Granted I already have a 2300KT for .22 and this one is solely for .177 target use
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I never built one with the intentions of having 2 calibers on the same gun.
More than once, I have built one and found out it didn't suit my intended purpose as I thought it would, and went back and started over, but in a different direction.
When building one, have at least an outline of what your final goal is, Preferably a plan, if not it can get expensive fast.
If you go down the road of, that breech is nice, that muzzle device is cool, that barrel band is the bomb, or I love the 3 wing co2 cap.
Such a way of building a gun you may find out that as a whole, the parts don't work in harmony, sometimes it's an accuracy issue, aesthetic, or an ergonomic issue.
Once you build a gun that does suit your needs/wants, it's just about as easy and cheap to build another one, especially after 3 or 4 builds, you have the parts in a bin to make a complete one.
Even the higher end guns where barrel changes are just a matter of loosening a screw or 2 (FX Impact for example) a lot of guys like the IDEA of changing calibers on the fly, but in practice, it's more of a pain.
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yes i've built them for multiple calibers. my first co2 build was for my son. originally in .25 with a marauder green mountain barrel. i then aquired LW barrels in .22 and .177 for it. the breach/barrel bolt for the .25 is dedicated to that caliber and the t.p. .. an additional breach was used for the .22 and .177. and of course the bolt for each barrel. changes are quick and easy.
i used the p-rod trigger group and so a change in hammer was in order. i chose the p-rod/challenger hammer assembly , this consists of the hammer,striker and acetal pin. since i went this route i decided to use the rear cap of the p-rod as well. it only needs 1 hole drilled and tapped to make it work. this allows me to adjust the pre-tension and throw with no disassembly. so once i get the barrel and/or breaches changed, it's easy and quick to do a tune for the specific application .
the original t.p. is fine for .177 and .22 as long as one can adjust the pre-tension. for indoor target shooting i set it up in .177 and get 75 very even and consistant shots per cartridge.
hope this helps
kj