CMMG upper...help

[tanakasan]

+1 Taccom pressure plug. Get the reliability kit with firing pin.

Robert

[nrakid88]

Thats a bummer man. i cant remember the last malfunction mine had, and i shoot several thousand rounds a year through it

[green grunt]

Thanks for the input....using a h-buffer with stock carbine spring

what is a Taccom plug ?

did yours settle down or did it need a bit of work ?

[paintballdad]

I had the same problem with my CCMG upper over a year ago. Shot Federal, Winchester and Fiocchi .22LR ammo with similar results.
Shadow65 recommends still using a buffer and action spring even though it is not needed with a 22 upper. I also recommend using a Taccom Pressure Plug.
If the problem persists then send it back to CMMG. They might need to buzz the chamber and check the firing pin.

[green grunt]

Lower is a SOG , with a DPMS lpk , good solid lower with stock factory parts , maybe a stronger hammer spring ? it works fine with a 5.56 upper...

may have to send it in...don't know yet , would 300-400 round count be good for a break in ?

[ejhc11]

Maybe a new stronger hammer spring, also you don't have a polymer lower do ya?

Don't mess w/the CMMG upper - its got a lifetime warranty. Contact Dave aka Shadow65 here on Calguns, he can assist you if you need to send it in or troubleshoot the system.

I owned two and them been flawless.

[green grunt]

Hello to all.....got a small problem with my CMMG complete upper , just a bunch of faliure to fire with diff. types of ammo , looks like light strikes..... ??

ammo: fed 40grns , cci hp , and rem golden
mags : black dog 10 rds (4)
lower : box stock AR15 lower , works great with a 5.56 upper in place

I could not get thru a 10 rd mag with out having at least 4-5 failure to fire

the fed 40grs bullets were real bad , I went thru a few mags and not even one round would fire ! (put them in my handgun and all went bang , not the ammo)

the rem golden bullets were the best of the bunch , with maybe 8 out of ten would fire fine

the cci velocitors were not much better then the fed ammo !

when it went bang....the groups were good at 25yrds

I got so mad at it ..I almost went to the truck to grag a pair of nippers to cut a coil or 2 off the firing pin spring....thought I better ask a few others first if they have had the same trouble before cutting on it !

total rounds 1st trip out...about 80 , and all the same trouble , break in ?

2nd trip (today) about 300+ rounds , should be broke in by now ?

help / input would be great.....thanks in advance...

Semper Fi
(can't get the darn photo thing to work...sorry)