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Jim Gillilan's Custom 1322 Carbine

Jim Gillilan's Custom 1322 Carbine w/Custom Stock

Here's one I'm especially proud of and is modded all over, doing 12fpe at 15 pumps.
Stock is Teak from Thailand and super light weight 1322 Carbine!

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Some tuning and testing...

April 23 2017 at 7:51 PM

WyoMan  (Login WyoMan)
Crosman Forum Member
from IP address 65.131.49.108


Response to Re: 1322 PCP - the skeletonized valve doesn't leak anymore...

The extra volume did help, no doubt, but I'm now facing another reality... I think - small pump volume. There's probably only so much you can do with 1.1 cubic inch at 80% atmosphere. But still, it has better performance (efficiency) than anything else I've got... and with a 12" barrel.

 [linked image]

With 4 recharge pumps it made 5.7 fpe, with 3 it was 4.7. The prior version (smaller valve) did 5.2 fpe with 4 recharge pumps. I am surprised and impressed with the ES and accuracy. It makes a nice 10m pistol.

Some other notes...I cranked-in the RVA as far as it would go and got 578 fps or 11.8 fpe from a full charge. It didn't empty the valve but I'm not going to re-spring to dump 17 pumps. I took a second shot when it was tuned for 4 recharge pumps and got 404 fps... 3 fps higher than the average first shot. That's pretty nice. There are lots of ways to tune these and I'm still getting my feet wet...

One more gratuitous pic (to make sure it happened) happy.gif

[linked image]

Wyo


 
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