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9/19/2017 7:27:10 PM
Posted: 3/9/2006 5:45:58 PM EDT
My 9mm AR is trying to go 2 round burst on me it happens about twice a mag?

Where do i need to look?
Link Posted: 3/9/2006 5:56:36 PM EDT
No expert, but disconnecter and disconnecter spring is my guess.
Link Posted: 3/9/2006 6:02:53 PM EDT
I should add the lower is a brand new RRA that I've shot about 60 rounds through
Link Posted: 3/9/2006 6:04:13 PM EDT
Willing to bet that the upper is an olympic arms?
Link Posted: 3/9/2006 6:09:09 PM EDT
If you bet money youd win.
Link Posted: 3/9/2006 6:13:56 PM EDT
A notorious problem with the Oly uppers.

Try replacing the spring inside the firing pin. Better yet, pull it out and stretch it out a bit.

If that doesnt do it, you may need a heavier buffer

Problems still? try it on a different lower, it very well MAY be the disconnector spring but with only 60 some rounds in a brand new lpk its unlikely

PS I can accept paypal for all gambling debts
Link Posted: 3/9/2006 6:16:01 PM EDT
[Last Edit: 3/9/2006 6:16:38 PM EDT by superdav]

Originally Posted By ggllggll:
A notorious problem with the Oly uppers.

Try replacing the spring inside the firing pin. Better yet, pull it out and stretch it out a bit.

If that doesnt do it, you may need a heavier buffer

Problems still? try it on a different lower, it very well MAY be the disconnector spring but with only 60 some rounds in a brand new lpk its unlikely

PS I can accept paypal for all gambling debts


Thanks, I'll switch lowers (I have another RRA and OLY lower)and if that dont work I'll pull the spring
Link Posted: 3/9/2006 6:18:49 PM EDT
Worth a shot, or two
Link Posted: 3/10/2006 4:18:35 AM EDT
Take a look at the firing pin is it sticking out(stuck)? I had this happen on my OLY. At 1st I thought it was something in my lower so I swapped lowers. Went back to the range and it happened again. I just threw the whole bolt asm into a small plastic tub with hoppes, cleaned it and the firing pin. Then reoiled. No more doubles or triples after that.
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