
Originally Posted by
Tweightwee
The popped primers happened with both BCs and both bolts in both BCs. But only with the Q3131A, and not with Privi or the, I misspoke earlier, LAKE CITY "green tip". I suspect the IMI loaded Winchester is a little hotter than other 5.56 ammo and is unforgiving on "tight" chambers.
The only malfunction I get when using the new BC and NOT using the Q3131A is short stroking. The gun does not pick up the next round, closes on an empty chamber and does not lock open on the last round.
I do want to find a Ned Christiansen reamer to resolve chamber problems beyond doubt.
As said popped primers is a common sign of an AR with a tight chamber.
Classic short stroking is not enough gas. This doesn't necessarily mean the gas port is too big or too small. Most times it's a gas leakage problem somewhere meaning leaking at the gas block, gas tube, or carrier key.
To test for short stroking load 1 round per mag, seat the mag, chamber the 1 round and fire. If the gun doesn't lock back with 5.56mm NATO pressure ammo and when the rifle is properly lubed 99.9% of the time it's short stroking.
It could be overgassed and not picking up the next round nor locking back because bolt velocity is so fast that the mag cant' keep up with bolt. This is rarely ever the case.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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