Disappearing Air-Leak? - Help!!

2770 Views 7 Replies 4 Participants Last post by PsychoYumYum, Sep 14, 2015

PsychoYumYum

Discussion Starter · Sep 10, 2015

So.... this has been baffling me for a while. I have an CMYA M14, with upgraded motor, piston+piston head, and air nozzle. When I test compression its all pretty good (I know it could be better but I'll live with it). However here comes an the issue................ when I put the gun together I get about 190 fps if I load a single bb in the magwell or use a magazine BUT if I muzzle load the gun, tilt it back until I hear the BB make a seal, boom! 410 fps (which is what I was expecting)

So in summary:

(high cap) Magazine = 190fps (no hop set)
Muzzle Load = 410fps

I've tried this with different bucking, changing the hop, rhop even. its consistently bad

the best improvement has been trimming the lips off a bucking, I then get about 330 fps if I muzzle or mag feed the gun.

ideas anyone? I did try a google and haven't seen anyone else with this issue

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luke213

· #5 · Sep 10, 2015

Check the spring on the tappet may not have enough force to chamber the bb stopping before the nozzle fully seals to the bucking.

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luke213

· #7 · Sep 10, 2015

Yeah its a good system but frustrating to someone like me that's very used to version 2 stuff.

I'd just make sure that spring is strong enough because I can see that happening. Hop up unit double check that its sitting properly against the box too. I've had problems in the past with it sitting slightly out of sorts causing issues.

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