Could be the disconnector timing, could be a disconnector spring, could be a worn sear, could be some gunk or debris collected in the lower.
Originally Posted by oly85
Perform a function check, Charge the handle, make safe then attempt to fire, your AR should not fire. Select the fire, pull trigger weapon slowly to feel the trigger, and it should fire. Don't release the trigger, charge the AR again and release the trigger. You should experience a reset, not a fire. Wash rinse repeat.
Detail strip the lower clean thoroughly and reassemble. If it still happens take to a gunsmith or buy a new "lower parts kit" and rebuild the lower. While the lower parts kit is over kill and not all parts will be used (like pistol grip and pivot pin and mag release etc... ) these are nice parts to have on fan for what ever. The LPK will no doubt fix your problem, but gunsmith may be able to retime the disconnector if that is the problem.
Last edited by CGS; 08-14-12 at 00:14.
NRA Life Member, ISRA Member, American GunSmith Institute Certified GunSmith, State of IL Certified Carry Concealed Instructor, NRA Instructor, NRA RSO.
I do not suffer from TTD, Top Tier Disease.