[ARCHIVED THREAD] - First build - weird FTF problem

Posted: 7/19/2013 7:56:19 PM EDT

BRS 80% lower, completed by myself well within specs, M4 upper and LPK from M&A Parts. Everything function tests perfect. Fired for the the time today. it might shoot 1 round, 10 rounds, 3 rounds, 7 rounds, etc. But then the trigger goes "click" with no real engagement. It seems like the FCG gets hung up on the disconnector, but when I break the weapon down, all works fine. Any ideas about what I'm missing?

Posted: 7/19/2013 8:05:36 PM EDT

[#1]

Springs in right? Another option is maybe your lower isn't in spec. Double check specs

Posted: 7/19/2013 8:32:42 PM EDT

[#2]

is the hammer spring on backwards? this can cause light primer strikes as well as the trigger pin walking and misaliging parts.

Posted: 7/19/2013 8:43:04 PM EDT

[#3]

also, if you did that 5 min DIY trigger job, i've seen ftf bc of light strikes as well.

Posted: 7/19/2013 9:05:43 PM EDT

[#4]

Won't know until I can retest if it was the problem, but the hammer spring was installed backwards. I'm confident this was the problem. This forum is the best!

[ARCHIVED THREAD] - First build - weird FTF problem

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[ARCHIVED THREAD] - First build - weird FTF problem

[ARCHIVED THREAD] - First build - weird FTF problem