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9 mm AR 15 #15557349 12/22/20
Joined: Dec 2015
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2500HD Online Content OP
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Assembled a 9 mm RR 15. Only firing as a single shot. Will not cycle the action. Everything moves freely when operating the charging handle. Only thing that is odd to me is when the upper is off the lower or tipped up from pulling the back pin the bolt carrier will slider backward extending out of the rear of the upper. The spring and buffer hold it from doing this when the upper is installed on the lower. No gas tube on the 9’s. It’s the buffer to heavy or is there something wrong or missing on the bolt carrier. (Slides freely no latch tension when not on the lower.
Colt mag adapter ( fit in nice)
9 mm upper and bcg from AR15 Parts.com.
Stoner buffer tube
9 mm buffer 8.2 oz
115gr. fmj 9 mm target ammo.
Any help would be great.

BP-B2

Re: 9 mm AR 15 [Re: 2500HD] #15558602 12/22/20
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smike308 Offline
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It does look like your buffer may be too heavy. Try ~5.4oz.


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Re: 9 mm AR 15 [Re: 2500HD] #15558862 12/23/20
Joined: Apr 2008
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viking Offline
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Try some 124’s.

Re: 9 mm AR 15 [Re: 2500HD] #15563254 12/24/20
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RDW Offline
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Probably a blessing that it jammed, it will blow through 600.00 of ammunition in half an hour laugh


Dave

Re: 9 mm AR 15 [Re: 2500HD] #15569014 12/25/20
Joined: May 2009
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AH64guy Offline
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Originally Posted by 2500HD
. Only thing that is odd to me is when the upper is off the lower or tipped up from pulling the back pin the bolt carrier will slider backward extending out of the rear of the upper. The spring and buffer hold it from doing this when the upper is installed on the lower. No gas tube on the 9’s. It’s the buffer to heavy or is there something wrong or missing on the bolt carrier. (Slides freely no latch tension when not on the lower.
Colt mag adapter ( fit in nice)

9 mm upper and bcg from AR15 Parts.com.



I don’t understand why you bolt is pushing back out of the upper - from your description - I’m getting that it backs out of the upper a bit when the upper is opened and muzzle down?

It should stay forward, but there’s no tension from locking lugs, it will freely slide out - until it hits the ejection port door if closed, or the rear of the race for the alignment block on the top of the carrier/bolt.

IC-A

Re: 9 mm AR 15 [Re: 2500HD] #15569826 12/26/20
Joined: Aug 2008
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badwolf Offline
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No locking lugs on a 9mm bolt, its a blowback design. The buffer spring holds it in place. Your buffer is the correct weight for a 9mm. What's it doing when you fire it? Not ejecting? Ejecting part way? What lower do you have?

Re: 9 mm AR 15 [Re: 2500HD] #15570145 12/26/20
Joined: Dec 2015
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Not ejecting. Once when I had help watching it tried to open a little. Called AR parts and they recommend cutting a coil off the buffer spring one at a time until it cycles but not more than 3 coils. He said my buffer was correct weight and if cutting coils didn’t work to get back with him and he has a pistol buffer that for sure will work. The bolt stays in place with the dust cover shut. Moves back when open as it’s designed. No issues there. AR parts got back with me within a day of my email and were very helpful. Thanks for your help as well campfire. Let you know when it’s running smooth. Too many holiday get togethers last few days to play with the 9 lately.

Re: 9 mm AR 15 [Re: 2500HD] #15570332 12/26/20
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TWR Online Content
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Telling you to cut a coil or 3 off the buffer spring was not being helpful.

Re: 9 mm AR 15 [Re: 2500HD] #15580894 12/29/20
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badwolf Offline
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Built 2 ar9's with palemetto lowers, both had ejection issues. The fixed ejector had to be bent and straightened for them to work. Standard carbine spring and 8 oz 9mm buffer

Re: 9 mm AR 15 [Re: 2500HD] #15580895 12/29/20
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badwolf Offline
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Rudy, the mad machinist over on ar15.com helped me with those. He owns macon armory and is the ar9 guru

IC-B

Re: 9 mm AR 15 [Re: 2500HD] #15584168 12/29/20
Joined: Dec 2015
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Had a friend over tonight and we discovered the fixed extractor had wear on one side. We had to bend and straighten it to the carrier and we got brass extraction. Took a couple tries. I did not do anything to the spring yet.

Re: 9 mm AR 15 [Re: 2500HD] #15589513 12/31/20
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badwolf Offline
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The ejector has to be as close as possible to the top of the bolt and in the center of the slot. Your carbine spring should be fine. The face of the ejector should be square, if it's angled file it square.

Re: 9 mm AR 15 [Re: 2500HD] #15616201 01/06/21
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TripleL05 Offline
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I agree with the others. Your buffer and spring should be fine. I run a standard carbine spring with a heavy buffer in mine, you need to run a heavy buffer with most 9mm systems (blowbacks at least). I wouldn't touch the buffer spring. It would seem that the ejector is your issue if you are having problems, especially if it has wear on it. The 9mm ARs can be a little janky, but once they are running, they are a blast...


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