GTA
Airguns by Make and Model => Crosman Airguns => Topic started by: FuzzyGrub on November 01, 2012, 08:11:45 PM
-
This is my 1st project, and most of the info was found here and on a few other sites. Thanks for the input.
(http://www.joefishin.com/1377carbine01.jpg)
It has the Discovery .177 barrel, sights and related parts.
Crosman Steel Breach
Crosman Bugout stock and fore arm.
ATI SKS Cheek Riser
Crosman 3-9X32 scope (from my vantage)
(http://www.joefishin.com/1377carbine02.jpg)
A couple comments about the Discovery barrel: this has machined flat spots in the barrel for the sights. It also has a dimple mid-barrel, which I suspect is a tooling mark for holding during the machining, or where a barrel band screw contacts it. The barrel sleave from the Discovery will cover the rear machine mark. You would not need to add the sight. The front fake muzzle brake, covers the front machining. In both cases, a set screw tightens against these flats. The discovery fake brake, also has a half-moon cut-out under neigth, to allow for the air resivor tube. Just FYI it is not fully round.
(http://www.joefishin.com/1377carbine03.jpg)
Trigger work includes polishing contact areas, brass shim washers, moly, plus reduced tension sear spring and homemade guide.
Currently running 620ft/sec at muzzle @ 10 pumps (100 increase from barrel)
Below, you will find a 10 shot group at 10yds, bench rest, indoor range. A couple of flyers! ;)
(http://www.joefishin.com/1377carbine04.jpg)
Left to do: (when MellonAir parts arrive)
- Debur and Lube
- Install flat-top piston and valve
- Install pivot bolt
- Locktite and reassemble
- Wax fill bolt screw
- Shim the barrel band within the pump tube (there is some play)
-
Looks great, nice job, now go and enjoy it.
-
nice looking carbine.
joe
-
You did all the right things. It turned out great. Once you get the flat top piston and valve installed, it will be a powerful little pesting gun.
-
Nice job, it looks and seems to shoot great.
-
I just got my new Bug Out Kit last week. I want to mod it this winter.
Yours looks great.
Gene
-
nice job!
congrats!
-
Looks like it shoots pretty good! Nice work.
A 13xx or 22xx carbine is somewhere on my wishlist ;D ;D
-
Looks great,
What fore grip is that, Is that the stock bug out foregrip?
I like that much better than the stock 1322 skinny fore grip.
I wonder if i can buy that fore grip separate?
Anyone have a part number on that fore grip?
Or maybe a parts exploded view parts list for that gun?
-
Looks nice (and oddly familiar?).
JMJ
-
I bought a couple of the fore grips. They are from the 1389 that crosman stopped production on. You can look the part no. up by looking at the schematic for the 1389. About $10 when I was buying them a few months ago. It is also standard on the Bug out kit. Don't know the model of that one.
Darrell
-
The current Bug-out forearm grip (black) is part # 1389-025 and costs $8.75 plus shipping ($4 per order) from Crosman.
-
The current Bug-out forearm grip (black) is part # 1389-025 and costs $8.75 plus shipping ($4 per order) from Crosman.
Yep, that is the part number and what I paid.
-
The Mellonair piston, valve, and pivot bolt, came a few weeks ago. Installed all and adjusted piston, installed lighter valve spring, and discovery hammer spring. I couldn't get the chrony to work with any improvised lighting in the basement. :( I will have to wait until a sunny day to get some readings. It definitly feels like it has higher velocity at 10 pumps. Also at 15 pumps, getting complete dumping of air.
-
i have a backpacker that I will use for sqirrel,rabbit,etc. What improvement will increase power and accuracy best per-$? Also, does a scope really help over the stock sights for hunting? I am wanting to become a much better shot, so what is a good sight? Thanks.
-
i have a backpacker that I will use for sqirrel,rabbit,etc. What improvement will increase power and accuracy best per-$? Also, does a scope really help over the stock sights for hunting? I am wanting to become a much better shot, so what is a good sight? Thanks.
IMHO: this platform is not the best for a pure hunting rifle. While the longer barrel, flat-top piston & valve get the velocity up, it is still marginal for hunting. Iron sights are good for close range and a constantly moving target, but with marginal fpe, a scope is probably needed to make accurate head shots. With 12-15 pumps, a follow-up shot will take some time.
For myself, I'd use my Marauder or break barrel, before this rifle for dispatching varmits. This will be enough to kick the sand up and chase away the poop factories (canadian geese). Maybe a stupid red or striped rat.
-
A couple of things I want to mention:
- I found that the barrel band was pulling down on the barrel. This was causing most of my droop issue I reported earlier on. I sanded the inside of the band until sliding it in place didn't cause the barrel to pull in to the tube. The poi @ 10 yds went up an inch.
- I touched up the barrel crown, but did not appear to make any change. In the process, found that having the small barrel shroud on did. This turned out to be a set-screw issue. Ie tightening it down caused the issue. This is a Discovery barrel with Discovery shroud. Something Discovery owners might want to check.
-
Nice little rifle FG. BTW, how's the Vantage shooting?
Scotty
-
Nice little rifle FG. BTW, how's the Vantage shooting?
Scotty
Still doing well. Shot it a few days ago. It is a little more accurate than the 1377 carbine @ 10yds. The seals did come in, so need to do the lube/tune on it.
-
Looking forward to hearing about it.
Scotty
-
A good lookin 13xx you have, I'd slap an AO scope on it if I were you.
-
The sun finally came out today, and I got some pre-lim fps numbers. Only a few shots at different pump numbers. It was 20F so wasn't going to go thru 10 shot strings for each. Pellets are cphp.
5 pumps: 533 fps ave
7 pumps: 615 fps ave
10 pumps: 685 fps ave
15 pumps: 746 fps ave
-
Primo fuzzy, this looks and shoots fantastic.
-
Should I get a flat top piston before I make 10+ pumps per shot, or can I do that on the stock piston? Also, how would a red dot scope work out? Last question here, where do you Purchase the extended barrel?
-
I had no problem pumping to 12 with the stock piston, but not gaining much and would need the heavier hammer spring to use it, if it did.
The barrel is from Crosman (Discovery) about $17, but the sleave, sight mount, etc will double that. Unless you are planning to use the "iron" sights, the william optic are a bit pricey. I think that was another $30 for the two.
The two red dots that I have are for weaver/pic rails. Using an adapter would put them too high for my tastes. Otherwise, I would have tried them. I have the longer metal breach, so there should be enough room to mount them in front of the bolt. Or an offset mount on the back.
-
Very nice gun.
Good job.
-
That's Great!, I just love modding my 2240's, 2289's, and 1322's. One of my favourites has to be a 2240 I turned into a real tack-driver. I added a .177 Crosman steel breech, 10.1" Lothar Walther barrel, Custom camo'd shoulder stock, and topped it off with one of Larry's(Airgun Artisan's) 16-hole ported m/b's, This beauty can stack rounds one on top of the other all day long, and w/ a m/v nearing 600fps w/ lead, and around 725fps with Skenco Black Max alloy rounds. topped out at 750fps with Crosman SSP's which is cool even though the rounds come in at less than 5gr.
The 2289 I've modded came out great as well, Flat-Top-Piston, US Valve, Crooked Barn Aluminum breech, 24" barrel(meant for a 2260), and lastly one of Larry's m/b's, It's deadly in the accuracy dept,., and power-wise it's no slouch sending a 14.3gr Crosman dome downrange at 725fps, and with alloy rounds you can easily add 25% to that(especially w/ Crosman SSP's, which are extremely accurate), I'd like to add that Pellet selection is crucial to any Crosman build as the rifling in their barrels is very slight. I highly recommend using JSB's, Air Arm's, FX, and if you can find them Kovohute Standards/Boxers have a great lead composition for their pellet's, almost pure lead with very little antimony used which translates into the pellet really gripping your rifling, I also wanted to add that the barrel length plays a big part in your gun's m/v If you can't get a 24" barrel, an 18" will do, http://scopesandammo.com/storefront/product_info.php/crosman-22-caliber-18-barrel-p-741 (http://scopesandammo.com/storefront/product_info.php/crosman-22-caliber-18-barrel-p-741) , I also wanted to add that "Scopes and Ammo" has one of the best selection of after-market/third party accessories you can find, http://scopesandammo.com/storefront/index.php/airgun-parts-custom-service-c-38 (http://scopesandammo.com/storefront/index.php/airgun-parts-custom-service-c-38) , Hope this helps. Cheer's, Andy.
-
Nice looking build, good job. Crosmans are a whole lot of fun to tinker with.
Andrew
-
if you want a 26" .177 barrel for your 1377 they are available too
if your red dots are tube style like the center point,tasco pdp or millet sp red dots any height 30mm or 1" scope rings fit perfectly