
Originally Posted by
powderkeg45
Just got my M&P 15A a couple weeks ago. Only has about 400 rounds through it. Anyone else having problems with FTFs? Tried a half dozen magazines, but still had a few ftfs. BTW, I'm new to the AR platform, and any help would be greatly appreciated.
I repaired a M4C members upper a month or more ago. (it was a S&W M&P15) that was giving his some weird jams and short stroking, not going completely into battery etc.
I replaced the carrier key and screws, staked properly. Removing the barrel from the upper receiver, reinstalled and torqued properly. Reamed chamber to 5.56mm NATO and it now runs fine. His barrel had been installed with approx. 10-15ft lbs of torque and I could turn the barrel within the upper by hand with the receiver mounted in the vise block.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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