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All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: Rob M on April 11, 2017, 05:29:57 PM
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I bought a 25 caliber NPXL barrel from crosman, under 20 shipped.. Removed the breech block from the barrel and started machining// No one wants those pics, so heres a few of the complete gun
(http://i746.photobucket.com/albums/xx102/robnewyork50/25%20cal%20plinker.jpg) (http://s746.photobucket.com/user/robnewyork50/media/25%20cal%20plinker.jpg.html)
(http://i746.photobucket.com/albums/xx102/robnewyork50/shroud.jpg) (http://s746.photobucket.com/user/robnewyork50/media/shroud.jpg.html)
just enough room to load co2 carts ( for those interested in the barrels , the muzzle thread is m12 )
(http://i746.photobucket.com/albums/xx102/robnewyork50/clearnace.jpg) (http://s746.photobucket.com/user/robnewyork50/media/clearnace.jpg.html)
ANYWAY , the high with 19.9s was 538fps or 12.8fpe , my goal was 500 fps so im pretty happy.. I dont hunt so for plinking , it simply hits harder and louder.. speaking of loud lol , heres a test shot before the shroud ,..
<a href="http://www.youtube.com/watch?v=2-SnFKs82dQ" rel="nofollow">https://www.youtube.com/watch?v=2-SnFKs82dQ (https://www.youtube.com/watch?v=2-SnFKs82dQ)[/url]
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Sweet!! I like it!!
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Nicely done.
Will be interested in following this one's progress.
Pretty loud bare-barreled, that long LDC will likely tone it down (but they do start to have a kind of odd hollow "thunk" sound when they are way-big).
Not a PCP, but I've kept a .25 gas-ram for several years that only makes 13-14 foot pounds (and I'd not complain if it were 12-13). It's slow, but as a short range rat-shooter, it's one of my favorites. Whole lot of "thump" without a blowing through shed walls/fences at exit.
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Very nice! Some of us like machining pictures. ;D
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Wow! That's kinda neat!
I never thought I'd want a .25, but what an intimidating can killer that should make!!
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thanks Dan , its the poor mans FX lol..
Criag , here ya go , this was the first step, get the springer block off the barrel ,and match the factory shank for the breech
(http://i746.photobucket.com/albums/xx102/robnewyork50/barrelpre%20p.jpg) (http://s746.photobucket.com/user/robnewyork50/media/barrelpre%20p.jpg.html)
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Nicely done.
Will be interested in following this one's progress.
Pretty loud bare-barreled, that long LDC will likely tone it down (but they do start to have a kind of odd hollow "thunk" sound when they are way-big).
Not a PCP, but I've kept a .25 gas-ram for several years that only makes 13-14 foot pounds (and I'd not complain if it were 12-13). It's slow, but as a short range rat-shooter, it's one of my favorites. Whole lot of "thump" without a blowing through shed walls/fences at exit.
The shroud has some serious internals , when friends are over , thats coming off for the noise " effect " lol.. Also , in the UK , wed be breaking the law ! (-'
39M , im gonna hang some pots and pans in the woods, been meaning too for a while
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Might make a nice squirrel / bunny gun , I did take a rabbit @ 22 yards with a .25 springer that had a bad piston seal, it was shooting crow magnums @ 450 FPS and maybe hit the rabbit with 4.5 LBS of energy. Sounds like a fun plinker for sure. :)
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Know we all like speed...but with co2 conversions made for sporting use, have always found the heavier pellets end up earning a lot more energy...they do shoot slower, but not so much slower that they don't end up making more energy.
Those 20gr. at about 540fps might turn into 31gr at 463fps...but that's 12.9 foot pounds vs 14.6 foot pounds...which isn't a "carp load" more, but you might even end up with a few more shots per fill. Almost all my "ratting" is inside of 25 yards, so the real world difference in trajectory is nothing.
When I am "ratting", will use the bluntest nosed .25 I can find that shoots well. If .25WC's were more commonly available (and they once were), I'd use them...want that immediate transfer of energy (the "smack") without a whole lot of energy on exit. At this velocity level, forget HP's...there is just not enough speed to activate the expansion features.
See that you avoided barrel shank O-rings. Have done that in rifles that uses this system of barrel sealing. So long as the fit is really good, there is minimal leaking (usually at the front,,,where the barrel enters the breech). Odd as it seems, one good cure for me was basic good old old-school rubber cement. Not super aggressive, if you need to remove the barrel, can defeat its weak hold.
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agreed Rob.might try some 25 grains.. What i did to avoid the rings , and have a floated barrel was machine the barrel into .400 .. then to get to the .397 breech hole i sanded.. tried again, sanded , etc etc.. It was super snug, insane, then i painted which added another .001.. So , Its airtight.. Atleast no blowby at my face or fingers I can feel..ALSO , being in LA , you know the armadillo issue , but i use my 22 rimfire for those.. Thats not really hunting, just eliminating a nuisance.
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Just check the front...it's a sneaky leak that happens to the o-ring barrels too (when the front of the two O-rings goes bad) and often goes in-noticed as it doesn't blow back...it blows forward along the top of the gas tube where you can't normally feel it.
As you aren't using the barrel band, would (but this might just be me) want that barrel tight to the breech...those little set screws aren't the worlds strongest fitting and there is only like (by eyeball) 8/10ths of an inch of barrel insertion into the breech. Free float can certainly work, but it needs a solid anchor.
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YEp, I added an 8-32 set screw in the sidewall of the breech where its thickest, I dont even use the top set screws anymore, Like you said , theyre more or less useless.
(http://i746.photobucket.com/albums/xx102/robnewyork50/set%20screw.jpg) (http://s746.photobucket.com/user/robnewyork50/media/set%20screw.jpg.html)
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Yeah! Pots and pans should make a good racket!
And get a trash can lid or an old cymbal and hang it waaaay out there.
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everyone in the neighborhood will know when my aim is true :D
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Two rifles (varmint and plinkster)..odd as it may seem, actually found the tapped holes (for the little set screws) to be good, the little set screws to be bad. Opinion was that the screws were a little undersize, but the holes looked fine.
Swapped set screws for better ones, have had no problems with stripping. BUT, if you crank down on the issue set screws, stripping is pretty likely.
Yeah..it's one of those things you're likely to find out "after the fact"...so not a lot of help.
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that actually makes perfect sense. I lost 2 of the lil buggers over time just shooting the gun stock lol
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Pretty neato. Thanks for sharing.
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hit 583 fps today, no major changes , just shortened the probe so the pellet sits right at the blast.. 15 fpe , not to shabby from a 129.00 dollar co2 gun and a 20 dollar barrel
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hit 583 fps today, no major changes , just shortened the probe so the pellet sits right at the blast.. 15 fpe , not to shabby from a 129.00 dollar co2 gun and a 20 dollar barrel
Cool, $129 plinker, $20 barrel + $$$ w/o your diy craftsmanship. ::) ;D ;)
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thank you sir.. Yes , were I paying someone , it would be cheaper to just buy a 25 cal gun lol
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Rob,
I like it.... what is the barrel length? Any reason one (who has machinery and skills) couldn't do this to a QB? I know Roy's kits are awesome, but I like building stuff occasionally and the price is right on this. :D
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thanks Kevin.. No problem, the QB would actually be easier because the stock barrel is closer to the barrel diameter of the npxl ( 9/16th )
not to mention , the barrel front is already threaded for an ldc , so as long as you have an M12 tap , man it was a breeze. You may need to make a bushing for the rear of the barrel but nothing major.. Some WD40 and the pin holding the barrel to the block comes right out.BARREL LENGTH was 19.6 i think , after machining , maybe 19.2 , ideal for big c02 power
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I think my QB will be finding a new purpose..... It hasn't been run much since I got the 2400 up to speed, this would be perfect.
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I think my QB will be finding a new purpose..... It hasn't been run much since I got the 2400 up to speed, this would be perfect.
so much more fun , the qb might get those 19.9s pushing 600 with some serious valve work.. IF the plink can do it the qb will no issue.. Although ive noticed in recent threads, QBS are coming from the factory neutered to 600fps in 177
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update , 31 grain pellets , contrary to projections resulted in a massive fpe loss. The 31 grain H+N grizzlys really engaged the rifling , that may be part of it since theyre essentially slugs.. But, they may be extremely accurate , yet to test that notion.. Ill stick to the 19.9s , those things seem to really move out of this gun , and are fairly accurate at 12 yrds ( usual plinking
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Nice work, Rob! I'm trying to avoid the co2/pcp side of the sport, but this sure looks like fun.
Off now to research Plinksters...
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thanks man.. Co2 12 grams are cheap , so is the gun and walmart is 4 miles away lol... Nicest gun ive ever seen under 200 bux, never mind 129 shipped. I too avoid PCP , too much hassle and I dont hunt ..This will not throw 25 cal as is out of the box, I literally have the valve maxed out in every regard but since I had that already done for the 177, the 25 cal swap was easy.
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I agree about trying to avoid the PCP. But a few co2's are a lot easier to carry around than a pump or a tank.
And at much less expense.
The QB is a bit on the heavy side. And I'd really like to stay local with a 2260 and it's heavy support in place.
But the plinkster sure covers a lot of bases.
Too bad the local supplier only has .177 because I really want a .22 co2 rifle without having to do machining.
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local supplier?? you live near mrodair?
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local supplier?? you live near mrodair?
Well it's a state away.
But I thought the only place you could get a Plinkster in .22 was another country?
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well, lets look..
he used to have the 22 i swore, but i guess that was only the varmint>
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So have you tried to modify the magazine to accept .25's or are you just using the single shot tray? Looks like there's not much extra room in those mags
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single shot tray milled out for 25 cal.. im betting the marauder 25 cal magazine could be fitted, it would be a tight fit, require more milling, and take some planning.
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Nice work Rob. I enjoy learning what's possible from you guys. When I take my guns apart, I'm just happy to get it back together right.
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AHHAHA, thanks ,im also happy to get it back together.. One thing I will say, the Plinkster is the simplest gun to work on ive ever owned..
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opened up the throat by .040, gained 40 fps , now hitting 632 fps with 19.9s peak , and the first shot from a co2 cart is always 625 ish.. 17 plus fpe on co2 isnt too bad.. Its defeaning now , so i never remove the shroud.. even with the shroud its no longer backyard friendly..
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Just looked the other day and the Plinkster is now available in .22, for $149.
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it might be less on the yahoo link ,129.99
http://yhst-139878093962642.stores.yahoo.net/airmaxplco2c.html (http://yhst-139878093962642.stores.yahoo.net/airmaxplco2c.html)
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The GTO's and the Ultra Shocks would be fun to try. What is your shot count per CO2 12g ?
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get about 18 shots per cart that are still above 580 fps if i take 30 seconds between shots... after that , theres a few more in the low 500s.not sure if those pellets are made in 25 caliber? ive tried 31 grain pellets , best i could get was 499fps .. granted those were slugs, not diablos which may do better
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That's not bad at all for the energy...bonus for the bigger bore. Not nearly as easy to manage that amount of energy per 12gr. with the "lesser" bores.
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Yes, Im shocked i didnt lose more shots when I did the throat bore.. I did some math today , and the actual fpe from the cart is still about normal , for the string .. 320 fpe or so.. And obviously its easier to get that with the bigger bore .