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The Range
Rifle & Shotgun Discussion
9mm AR Reliability Help.... (Pics)
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<blockquote data-quote="JesseR" data-source="post: 1504471" data-attributes="member: 5258"><p>I've exhausted my knowledge and internet searching. It's time to ask for help from my OSA family.</p><p></p><p>A year ago I purchased a 9mm AR from a member here on OSA. My understanding was the gun was used in 3 gun, reliable and good to go. Well I have not had the best luck with this gun. When I first took it out to the range with factory 115gn Fedral FMJ it would FTE while loading the next round every 4th or 5th round. Figured it needed hotter ammo, so I started reloading for the gun.</p><p></p><p>Reloads were hit and miss. I'd have the same FTE every 4 or 5 rounds. Upon reaching the max load data for TiteGroup, I decided maybe something else is the problem as the rounds are hot. *NOTE* I am not seeing any case damage at the current load. I do have brass discoloring from the AR but not from my Glock 17 or 26.</p><p></p><p>I was told the FCG was DPMS's, but I'm not sure.</p><p>[ATTACH=full]89385[/ATTACH]</p><p></p><p>Originally the gun had a HANN Top Loading Mag block installed. Upon inspecting, the ejector appears to be bent. </p><p>[ATTACH=full]89386[/ATTACH]</p><p></p><p>[ATTACH=full]89387[/ATTACH]</p><p></p><p>I do not believe it had a 9mm Heavy Buffer, however it did have a shorter spring then the rest of my rifle lowers.</p><p>[ATTACH=full]89388[/ATTACH]</p><p></p><p>The top buffer spring came in the gun, I've since changed to the lower buffer spring with RRA AR-15 take off buffer. </p><p></p><p>The gun came with a Ramped Bolt, but I don't know who made it.</p><p>[ATTACH=full]89389[/ATTACH]</p><p></p><p>So aside from the bent Hann Ejector and Buffer/Spring combo, All should be good. Too bad it isn't. </p><p></p><p>I decided I would start trying different know issue point to see if I could get it dump a full 33rd mag with out a problem.</p><p></p><p>First I replaced the buffer spring with the lower, longer spring. I then added a new unramped bolt and finally a new bottom loading adjustable mag block.</p><p></p><p>[ATTACH=full]89390[/ATTACH]</p><p>[ATTACH=full]89391[/ATTACH]</p><p>[ATTACH=full]89392[/ATTACH]</p><p></p><p></p><p>Results: nothing has changed for the good or the bad. The gun will still have times of great success with both factory and relaod as well as continual FTE's with both types of ammo. All of my Mags are C-Products, 20 & 33 with black and orange followers. Regardless I don't see any major change in the operation of the gun.</p><p></p><p>The only thing that provides 100% reliability is if I load just one round at a time in a Magazine. It will fire and eject each round every time. Put two rounds and I have a 50-50 chance of it ejecting the first round and loading the 2 round. </p><p></p><p>Go with 5 or more rounds and it is hit and miss for success.</p><p></p><p>So, what do to next? I built my neighbors 9mm AR with a RRA lower, RRA 2-stage trigger, Unramped Bolt and bottom loading Magwell mag block. His gun is 100% reliable... aside from the Trigger, mine should be too!</p><p></p><p>I humbly submit my problem for your help and suggestions!</p><p></p><p>--Jesse</p></blockquote><p></p>
[QUOTE="JesseR, post: 1504471, member: 5258"] I've exhausted my knowledge and internet searching. It's time to ask for help from my OSA family. A year ago I purchased a 9mm AR from a member here on OSA. My understanding was the gun was used in 3 gun, reliable and good to go. Well I have not had the best luck with this gun. When I first took it out to the range with factory 115gn Fedral FMJ it would FTE while loading the next round every 4th or 5th round. Figured it needed hotter ammo, so I started reloading for the gun. Reloads were hit and miss. I'd have the same FTE every 4 or 5 rounds. Upon reaching the max load data for TiteGroup, I decided maybe something else is the problem as the rounds are hot. *NOTE* I am not seeing any case damage at the current load. I do have brass discoloring from the AR but not from my Glock 17 or 26. I was told the FCG was DPMS's, but I'm not sure. [attach=full]89385[/attach] Originally the gun had a HANN Top Loading Mag block installed. Upon inspecting, the ejector appears to be bent. [attach=full]89386[/attach] [attach=full]89387[/attach] I do not believe it had a 9mm Heavy Buffer, however it did have a shorter spring then the rest of my rifle lowers. [attach=full]89388[/attach] The top buffer spring came in the gun, I've since changed to the lower buffer spring with RRA AR-15 take off buffer. The gun came with a Ramped Bolt, but I don't know who made it. [attach=full]89389[/attach] So aside from the bent Hann Ejector and Buffer/Spring combo, All should be good. Too bad it isn't. I decided I would start trying different know issue point to see if I could get it dump a full 33rd mag with out a problem. First I replaced the buffer spring with the lower, longer spring. I then added a new unramped bolt and finally a new bottom loading adjustable mag block. [attach=full]89390[/attach] [attach=full]89391[/attach] [attach=full]89392[/attach] Results: nothing has changed for the good or the bad. The gun will still have times of great success with both factory and relaod as well as continual FTE's with both types of ammo. All of my Mags are C-Products, 20 & 33 with black and orange followers. Regardless I don't see any major change in the operation of the gun. The only thing that provides 100% reliability is if I load just one round at a time in a Magazine. It will fire and eject each round every time. Put two rounds and I have a 50-50 chance of it ejecting the first round and loading the 2 round. Go with 5 or more rounds and it is hit and miss for success. So, what do to next? I built my neighbors 9mm AR with a RRA lower, RRA 2-stage trigger, Unramped Bolt and bottom loading Magwell mag block. His gun is 100% reliable... aside from the Trigger, mine should be too! I humbly submit my problem for your help and suggestions! --Jesse [/QUOTE]
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