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Posted: 12/21/2016 9:11:29 PM EDT
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My 11.5 pistol has been short stroking recently on poly Wolf 55 FMJ. I don't recall it having trouble before, but I've made some changes recently and I'm trying to locate the issue.
The barrel is a non-chrome lined 556 chamber Shaw from 2005 when I first built a pistol. Bolt carrier group is standard FA. I recently switched to a Sig pistol Brace kit. Various GI mags. Standard carbine buffer. Gun will run brass ammo, including my reloads, but chokes on poly Wolf. This wolf ammo clocks at about 3000 fps out of my 20", so I don't think its underpowered. I've tried replacing all the gas rings, checking the buffer spring length, comparing the buffer tube length between the pistol tube and a carbine tube, still short stroking. The newest change was the Sig brace, but it looks to be no different internally to a carbine tube. any thoughts? Thanks. |
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