Things that control bolt lock back when empty:
Bolt catch...it has to have the full range of travel.
Bolt catch weight...adding a bolt catch device which adds weight to the bolt catch can make an otherwise good functioning bolt catch stop functioning. Adding weight to it with an aftermarket device slows its upward travel.
Magazine follower travel and mag spring pressure...... Follower has to rise high enough to lift the bolt catch. Mag spring has to lift the follower enough to catch to bolt catch in the time the BCG is to the rear. Follower might be in 100% condition but if the mag spring can't get it to were it needs to be at the right time it's useless.
Ammo...if the ammo is so damn weak that it's not making the bolt carrier move ALL the way to the rear where it contacts the very interior end of the receiver extension than the bolt may not lock back nor allow the next round in the magazine to feed into the chamber.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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