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Can be used with C02 or high pressure air. The angled transfer port directs air / C02 pressure more directly to the pellet chamber. Boss Valve for Crosman 2240, 2260, 2300 Series air Rifles or Pistols Great Modification. Uses standard 12 gram C02 cartridges like Crosman Powerlets. Modification Parts; Seal Kits; Your Compared Items. GC-01 Crosman 2240 converted to.177 Target with a 10' barrel re-crowned by Gmac and free floated fitted to a Gmac 6' Steel breech with brass extended probe. A Gmac trigger kit is fitted with a brass trigger, stainless steel sear and adjustable spring. SUBJECT TO THE VCR Act. GC-01 GC-01 2240 Target Pistol.177.
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Various hpa airgun conversions built by JDS including the Crosman,2240,Crossman 2250,crosman2260 and the RWS 850.
Now I don’t mean my crazy neighbor who screams obscenity’s at himself when he comes in and out of his house. But that’s another story. Joking aside, im talking about regulator creep.I have been battling reg creep on my ninja regulator. I changed o rings to 90 duro on piston, I popped out the piston seat(little white ball on end of piston)and flipped it around, cleaned and lightly applied thin coating of silicone grease on Belleville washers but I’m still getting those slow few shot when gun sits. What can be done to correct this, is possible to change piston seat to a harder material to help?
Inspect the little plastic ball at the end of the regulator spool. After a while, it will become indented and/or worn and you'll get creeping and a shift of the pressure setpoint (due to more travel of the spool required to get it to seal off and halt the transfer or high pressure air from the bottle). If you're careful, you can use a flat-tipped punch to push it out, and you can flip it over and reinstall it. Otherwise you can buy a rebuild kit for around $15. FYI, the O-rings have nothing to do with creep. Diablo 2 paladin skill tree.
If there's a flaw in any of them, you'll just get leakage to the outside world. Nearly all regulators suffer from some degree of creep. How the gun deals with it is MORE AN ISSUE of how well balanced pressure set point is to hammer strike and IF OR NOT your operating near the velocity peak in bell curve on / off regulation.
When your tune is such that More plenum pressure creates more velocity or less velocity your on either side of the peak. In setting up competition PCPs the trick is to get regulator set matching hammer strike at velocity your wanting so that slightly Less Or slighter More pressure within plenum really has little to no effect on the velocity.
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In doing so your wanted set point pressure gives exactly the speed you want and any Reg Creep or soft reset being lower than normal within 100-150 psi of set pressure does not effect the speed. WALA stability!!! As too REPLACING the Ninja ball with something else. Yes you can given the tooling & skill to set a PEEK stub in there and true it up PERFECTLY square. Then do the same at seat end of body making sure it is PERFECTLY flat & true.
Spin lapp them in and you can get far better set pressure stability. Creep is the dirty little secret that exists with regulators. That first shot (or two) is just going to be lower in velocity typically after the gun sits overnight or for a number of hours. I agree with Scott, you can minimize the effect of regulator creep with a lower balanced pressure tune, but for a power tune it is going to be there.
Your best bet is to take a dry shot or two before a hunting day or competition which will buy you some time for a few hours before creep sets back in once idle for an extended period. I have rebuilt my Huma and played with it quite a bit to minimize the creep, but can't quite rid it completely. I'm thinking the initial shot velocity is going to be either faster or slower depending on the tune. In the cases I have at home that first shot is hotter, perhaps because they're both relatively low regulator setpoints. My son's 2240 carbine with extended HiPAC tube and Robert Lane regulator (the CO2/HPA conversion model, turned down a bit to fit inside the HiPAC ahead of the Crosman tube) is averaging 620fps with 13.43gr JSB Express in.22', but the first one down the bore after a short while un-fired can be as high as 632fps. That's with the Lane regulator setpoint at about 800psi output. And it's similar with my QB78D carbine, using a 13ci Ninja bottle and a stack of Bellevilles using a setpoint around 1,100psi.
That one gives me an average of 690fps with JSB 18.13gr, but left alone for perhaps 5 minutes or longer the first shot is always at least 700fps. I've put a pressure gauge into the plenum with the 2240 so my boy can watch for the needle falling into the low pressure zone, knows when he needs to get me to pump it up (though the squeaking of each shot as the thing falls off-reg tells him the same thing as it turns out. Besides being really funny to hear). It's obvious there's regulator creep as it'll initially go to 800psi, but then within a minute or two will climb to about 950psi, fast enough that the little dial hand can be seen moving. I'm just guessing, but perhaps with a setpoint of 1600psi or even higher, valve function gets truncated by any excess pressure in the plenum, resulting in velocity actually dropping rather than rising as in my two examples. I used the word typically to leave room for the exceptions.
With the hammer spring adjusted for the reg set point, any rise in pressure against the valve from creep will apply more pressure against the valve. With the hammer spring fixed, will cause the valve to open less lowering the velocity until the set point returns to the initial hammer spring tuning. At least that is the effects on my Marauder. I find the Huma fairly stable and does not rise much more than 150 to 200 psi overnight or over several days.
It takes a long time to see this rise on the gauge and if out hunting for the day I don't see any creep issues after a couple of dry shots before the hunt. Before rebuilding the reg, the creep was a big issue and only took a few hours to creep up as much as 400 psi in just a few hours at rest. The dynamic sealing disc (Huma) and O-rings do wear/age and need servicing periodically.
400psi would likely blow my plenum-side burst disc. Wouldn't want to hear that again. Like when I miscalculated springs and spacers in tuning my Ninja reg and hit about 1,500psi, blowing the so-called 1,800psi disc (yes, I know now that there's a lot of variability with those little discs, and that there's pressure shock when re-filling). Neither the QB nor my son's 2240 drifts any more than about 180psi in my experience, even sitting in the closet for a month.
A roughly 10fps velocity rise isn't going to change POI significantly enough to worry me when a grey squirrel turns up. I just want to reiterate what Scott was saying about the way the gun is tuned will determine how susceptible it is to the effects of creep. So bear in mind a conventional unregulated PCP can be tuned to maintain a stable velocity over a wide pressure range. Download software how to program a griffon self learning remote instructions. It's not uncommon to have a usable range of 1000psi (say, from 3000psi down to 2000psi) with an ES of 4%. What you want is your regulated PCP set up in the same manner so a little variation in pressure, whether due to regulator creep or temperature rise or whatever, has minimal effect on muzzle velocity.
Fortunately these pressure swings are nowhere near 1000psi so you don't have to tune the daylights out of your rifle to achieve a sufficient degree of stability. Generally all you will need to do is adjust your hammer strike until you find the maximum achievable velocity, and then simply back it off until it's about 30fps less. And then WALA stability!!! As Scott puts it. I've built a number of rifles using Ninja regs and it's not uncommon to maintain a 15fps ES whether it has been 10 seconds since the last shot or 10 days.
Many of my hunting or pesting opportunities will have anywhere from a 30 minute wait to a 3 hour wait and I know I can count on the rifle to put the pellet exactly where asked when the time comes. The bottled.22 cal QB78 is often called upon to make 50 - 70 yard shots after standing idle in the corner for a week, 2 weeks, or 2 months.and it never disappoints.
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I don't mind telling you how nice it is to have that sort of confidence when reaching for a rifle. It really pays off to set it up right.
Sorry I forgot to add the approximate cost of the modification. As I stated the braided line was $30, the 6 1/2' 1/8to1/8 high pressure hose was $23, 3-elbow fittings about $10, QD from amazon $13, Ninja 13ci bottle $60 and CO2 Adapter Fill Station Remote with 3000psi Gauge (china) $13. I would suggest before purchasing a 2240 that you look into the custom shop on crosman.com and buy a 2400kt with steel breech and adjustable trigger with a skeleton stock and a barrel of your choice from 14'-24' for under $90. Also forgot to mention i have a 10.375' barrel on my 2240 in the video that I purchased for $30 from amazon.