AR15 2nd round-Non firing issue

Is the hammer cocking? Could the sear be slipping off the cock notch and following?

Disconnector is not catching the hammer allowing it to follow the bolt. Make sure the disconnector is installed properly and the spring is not upside down.

bmitch said:

Spring looks right, but not sure of Disconnector. Never taken 1 apart, so a little hesitant.

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There are loads of photos and videos on the net. You should be able to find something to demonstrate correct assembly/disassembly. Look there, study, and come back with any further questions.

If your disconnector is missing the catch, then you'd see the hammer following and the trigger would be "dead" as it would be after dry firing.

I don't believe JeffG's expectation of a slipping sear will be the case, but it's easy to test - pull the trigger and hold it hard to the rear, regain sight picture on target, and release the trigger. If the disconnector is catching but the sear slipping, when you release the trigger, it will fire again when you release the trigger to reset. Disconnector issues cause following (hammer chasing the bolt carrier into battery), slipping sears don't cause following if the shooter has proper trigger follow through, they cause doubles (the hammer will follow home then when the trigger is NOT held to the rear).

Most likely, as in 99% likelihood, it's a disconnector issue, simply not disconnector travel to catch the hammer with the trigger pulled.

Ran into this last week on a PSA lower. The disconnector was not releasing the hammer so it never made it to the main sear. Two or three strokes with a stone on the hammer hook fixed it right up.

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