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Posted: 2/6/2017 9:24:09 PM EDT
| I am wanting to build a 9mm PCC. I have an ATI omni hybrid upper receiver. I have been told not to use a polymer receiver, on a blowback gun. Is there really an issue with this or would it be OK? |
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9 m.m.'s are more jumpy from my experience, I have assembled 9 of them over the years. But buffer weight and spring rate can be tuned to compensate.
If the manufacture says don't do it on a plastic part, I would believe them... If they dont mention it, I would tune it for the lowest recoil impulse. Glock seems to run fine in 9 m.m. 
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Can't think of any reason why it wouldn't work, although with the added mass of a blowback carrier it'll see more stress than a 5.56 DI setup.
If I had to do it, I'd go with a heavy (8oz or more) dedicated buffer and stay away from hot/+P loads. Or just save the Omni for another build. My biggest concern would be if you had a OOB, even a small one could permanently damage the upper. I've got a bunch of different PCCs and my 9mm ARs are the only ones stout enough to run +P ammo on a regular basis. FWIW I tried swapping the RRA 'multi-cal' lower on my 16" 9mm AR (ramped bolt) with a polymer lower that had a poly FCG. Hammer would not reset at all. |
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