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Posted: 6/8/2013 6:23:46 PM EDT
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Quick run down of rifle.
Spikes lower Adams arms 11.5 upper Phase 5 buffer tube with carbine buffer Took it out to the range 2 weeks ago and had short stroking issues. Changed out the h buffer to a carbine then shot it. First round jammed then it ran fine after that (Oiled from the factory). Today I went back to the range and had short stroking issues again. Tried different ammo and wiped oil off the bolt. A few min later after clearing some more jams it started working fine. Put about 100 rounds through it flawlessly. Am I using too much oil? I wet the bolt like any new ar but it doesn't seem to like that. Also the receiver had some wear marks afterwards (nothing I would consider unordinary). Too tight a tolerance from the factory maybe? |
| i have a AA 11.5 factory upper also and mine had issues with steal cased ammo. AA states their uppers are designed to run with a stock carbine weight buffer, that said, i have been running a Spikes T2 with quality brass ammo and have yet to have an issue anymore. i have read numerous post that some AA uppers need several hundered rounds to run in and then never have any reliability issues again. i personally have had very good luck with AA |
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Quoted:
i have a AA 11.5 factory upper also and mine had issues with steal cased ammo. AA states their uppers are designed to run with a stock carbine weight buffer, that said, i have been running a Spikes T2 with quality brass ammo and have yet to have an issue anymore. i have read numerous post that some AA uppers need several hundered rounds to run in and then never have any reliability issues again. i personally have had very good luck with AA It was brass cased ammo that I was running. After a few feed failures and cleaning some oil off the bolt it started to work fine. After that no more issues at all and it cycled about 100 rounds flawlessly. |
| I've had lots of issues with my AA 7.5inch upper. FTF's, FTE's, etc, all with different ammo. After 3 trips to tech support with them polishing the chamber twice, opening the gas port wider, and then replacing the BCG, I still can't get it to run steel cased ammo and even some brass cased including the PMC ammo they say they test them with. It's now down to either I have a bad batch of PMC (works fine in my other ARs) or I'm "somehow doing something different" than they do while testing. I've stuck with the carbine buffer they insist on using and have tried normally oiling the BCG to having it dripping wet with the same results. I've read/heard several people having luck with the Spikes T2 buffer though. |
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also have an adams 11.5" upper and the only time I have had issues is after I shoot about 4 mags of tula then it starts jamming up and having failures... the gun has less then 300 rounds threw it and I think it just needs broken in more, I am happy with it.. I use all kinds of oils from Otis to frog paste with no problems.
only advice I can give is make sure you have a decent spring and do a lot of hand cycling just to work the action some, also make sure their is nothing wrong with the bolt, I once had the cotter pin come out and that jammed the gun up, also make sure their are no burrs on the bolt or carrier.. and try to use some motor oil like 5-20 for a cars engine or something... also make sure your piston setting is on normal |
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If everything is aligned properly and there is no FRICTION on the op rod then buffers, ammo etc has almost NOTHING to do whweeter the gun will cycle or not. I can put in almost ANY buffer and ANY ammo in my AA kit custom made AR 15 and it will work flawlessly. Every one looks at the WRONG thing.
The FIRST thing to look at is ALIGNMENT of the gas HOLE in the barrel and the gas hole in the gas BLOCK> The reason this is seldom looked at is because you cannot VISUALLY SEE this issue!! You need to MEASURE the alignment!!! And yes, find out what the SPEC is for the gas hole size. I DO know the SPEC for a middy barrel is .078" for the gas hole size!! For OPTIMUM operation the hole in the receiver part of the GAS BLOCK should be directly over the gas hole in the bvarrel. Also, remove the spring from the op rod and CHECK for free movement of the gas rod. It MUST move back and forth wit ZERO friction....just GRAVTY should be able to move the rod. You need to twist the gas block until ths is achieved with te gas rod, OK?? With the BOLT in place you MUST have the proper GAP of about .20inches(.15 to .25") This is pretty important. Too TIGHT a gap or NO gap will screw everything up. MILL the length of the OP rod if it is TOO LONG. You need to position the gas block first regardless of the LENGTH of the gas rod. The gas rod length may HAVE to be altered. It depends on the spec of the brand of barrel u are using. SOME barrel do not jive perfectly with AA's specs...like my DD barrel. WE had to TRIM almost 1/'16 of an inch off my gas rod. The system did not work AT ALL until we did that first!!! We could NOT achieve gas block alignment with the TOO LONG gas rod!! I am not saying this is your problem. But something like this MAY happen. Once PERFECT aliment and GAP is achieved then the gun should cycle PERFECTLY no matter what!!! Capiche? This is critical. After that THEN u start to do other trouble shooting. 99% of the time the gas block/gas hole is the issue.....or BINDING of the op rod. that can do it too. Hope this helps. Let us know. My gun will cycle ANY ammo any time with almost any buffer or spring. I have PERFECT alignment of gas block to proper SIZED gas hole!!!!! This is the most critical thing to do. and then the gas block can not MOVE a fraction of a mm once u have achieved 1000% alignment!!! You MST be certain. the gun will work flawlessly once u have achieved alignment.and all else is in order. |
| Sounds great in theory, but mine has been sent in to AA for service 3 times as mentioned above and it still doesn't work with all ammunition like others do. Tried it again this weekend and same exact problems with PMC and Silver Bear ammo. A friend bought a 7.5in. AA upper same time I got mine, but he got his from another vendor. His ran my PMC and Silver Bear ammo without a single issue so AA saying I must have a bad batch of ammo doesn't hold up. I tried his BCG in mine, same issues. I tried my upper on his lower, which is the 5th lower I've tried, and still the same issues. So now that my ammo worked fine in another 7.5in. AA upper, that leaves it to me somehow magically pulling the trigger different than they do when they test it at AA. |
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Hmm, my 16" EVO Tactical Mid upper that I've had for about 2 months runs perfect through about 400 rounds so far. I did the build with a Spike's Buffer Tube and T2 Heavy Buffer. And, it shoots about 1 MOA at 100 yards. I say about because that's the best I can shoot so all I can say is it shoots as well as I can, LOL. I feed it all sorts of 5.56 and .223, mostly Federal XM193F, PMC Bronze and the American Eagle stuff. I have not shot any steel case yet. The only complaint I have is that when I pull the piston and rod out the front of the block the spring always gets stuck in the Evolution handguard somewhere.
Is the little metal guide/cap on the piston rod spring toward the bolt as it should be? If that's backward it could cause a short stroke as it would shorten the stroke length by blocking the rod about .5" more. Just my 2 cents. Don |
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