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Posted: 3/18/2006 11:20:46 AM EDT
I have a Colt HBAR that locks open with Q3131a, but not with loads like BH 75gr match.
Has anyone else had a similar issue with heavy barrel rifles?

Dr.
Link Posted: 3/18/2006 12:08:29 PM EDT
[Last Edit: 3/18/2006 12:11:19 PM EDT by theshootersden]
Its called short stroking and is usually caused by a gas leak... Check to see if the bolt carrier gas key is leaking... Also inspect the FSB to see if it is loose and the gas rings on the bolt for cracked or missing rings...
Link Posted: 3/18/2006 3:54:58 PM EDT
I would suspect that ammo before the rifle. Bet that BH smmo has a light charge of stick powder.
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