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Posted: 6/28/2016 1:46:54 AM EDT
[#1]
If the trigger sets fine when cycled by hand, then you're short stroking, which means your ammo is too weak or your buffer too heavy or a bit of both.
It's coming back just far enough to cycle out the empty and pick up a new round, but not far enough for your ramped bolt to press the trigger hammer down onto the disconnector, so the hammer just rides the bolt back home into battery. |
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Posted: 6/28/2016 6:08:44 PM EDT
[#2]
Thats kind of what I was thinking. Maybe go back to carbine buffer with the 6 quarters in the back of the tube as a spacer?
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Posted: 6/28/2016 6:36:43 PM EDT
[#3]
Quote HistoryQuoted:
Thats kind of what I was thinking. Maybe go back to carbine buffer with the 6 quarters in the back of the tube as a spacer? Sounds like a plan! |
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Posted: 6/28/2016 6:37:07 PM EDT
[#4]
the spacer is just for over travel to prevent breaking the bolt hold open.
if yours doesn't do that then you don't need it. |
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Posted: 6/28/2016 7:44:04 PM EDT
[#5]
What is the weight of the buffer...and the length of the buffer......sound like you have an extended buffer already......(spikes ST9-X ? ) if so the quarters in the tube could be causing the short stroke......what type of fire control? Standard AR with a rounded hammer or an aftermarket performance trigger?
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Posted: 6/29/2016 5:51:54 PM EDT
[#6]
Quote HistoryQuoted:
What is the weight of the buffer...and the length of the buffer......sound like you have an extended buffer already......(spikes ST9-X ? ) if so the quarters in the tube could be causing the short stroke......what type of fire control? Standard AR with a rounded hammer or an aftermarket performance trigger? Yes spikes st9-x don't have quarters in there now going back to carbine buffer and quarters if needed. May try other ammo with spikes buffer I always thought the Brass maxx was decent power ammo. Standard hammer ramped bolt standard trigger. |
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Posted: 6/29/2016 6:14:59 PM EDT
[#7]
when you retract the bolt with the charging handle......do you feel any drag of bolt on buffer tube wall or perhaps the ejector? ST9 X is a little heavy in my opinion for a 9mm I use somewhere between a 6 and 7.5 ounce...usually closer to the 6 ounce weight......also check your recoil spring...see if the surface is smooth.....I recently saw a spring that was very rough on the surface.......that was causing drag on the wall of the buffer....
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Posted: 7/5/2016 2:47:16 AM EDT
[#8]
found the problem I built the lower a year or so ago and some how missed putting in the disconnect spring found one in extra parts box and works perfect
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