7" RRA jamming issues.

thebaron

thebaron

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I've got a 7" ( or is it 7.5 can't remember). After I put about 150 round through it, the action begins to jam solid. It'll slam forward with a live round in it but not all the way so it can't be fired and it takes 2 people to get it open when that happens.

I've got to take the whole action apart and thoroughly clean it before it's good for another 150 rounds or so.

It's got a flaming pig on the muzzle if that matters.

Any ideas or is that "normal" for a short barrel? If that's the case, anyone want a short upper? Only used on short range trips! Lol
 
7.5" AR's, as you probably know, throw a LOT more powder back into the action. In addition to what others have said, check how much powder residue is inside the BCG and ensure the extractor still moves freely.

If all else fails, Brownells sells a coiled gas tube that adds enough length to make the gas system behave more like a 14.5" carbine - some people have luck with those.
 
double check and triple check the chamber for carbon build up where the case neck meets the lands.

I had that problem one time. Mine does that every couple thousand rounds (7" Upper as well).
You have to give it a good solvent (NOT CLP or any ALL-IN-ONE solution, they are NOT SOLVENT. Use a dedicated solvent, like Hoppe's, True Bore, MPro, Ballistol Bore Cleaner etc.) and some scrubing. It might have just been a heavy build up over time.
I don't have to clean mine all the time, only every 500 rounds (with oiling of the action every time i use it)

A good way to test it:
Take the upper OFF and BOLT out.
drop a new round into the chamber (not an empty because it is already expended) and see if it goes in ALL the way freely WITHOUT having to push it.
IT SHOULD.
If not, take note on where it starts to drag/stuck and clean/polish that spot. Sometimes when you look inside the barrel, it looks shiny, but it might not be clean because carbon build up can blend very well at certain spots.

Usually is at the very end of the neck in the chamber.
Not all barrels are equal, there's the odd one require polishing with fine steel wool.

Another problem could be a weak buffer spring. But less likely if it works for 150 rounds.

REMEMBER: OIL = OIL, SOLVENT = SOLVENT, they don't go very well together.

PS: I shoot ANYTHING 556/223 I come across and never have a problem in a particular brand. EXCEPT some junk Norinco ammo. MFS is fine, both the FMJ and HP.
 
i plan on a sbr ar, with luck in the not too distant future. keep us posted please on the outcome.
 
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