3gunDQ Posted December 22, 2016 Share Posted December 22, 2016 (edited) I struggled trying to get a single stage 3.5 CMC to work in my ar-9 for about a week until another guy put one in his and he had the same problem. CMC es no bueno in PCC so I'll see if the hiperfire will run in it(should). The CMC had reset issues and would fail to reset about 10% of the time. I emailed CMC but all I heard outa them was crickets. Edited December 22, 2016 by 3gunDQ Link to comment
Aircooled6racer Posted December 22, 2016 Share Posted December 22, 2016 Hello: I am using a CMC 3.5lb flat trigger and have had no problems at all with trigger reset or lighting off the primers. What bolt carrier group are you using? Thanks, Eric Link to comment
OPENB Posted December 22, 2016 Share Posted December 22, 2016 My CMC 3.5# single stage flat works with my PSA hybrid bolt. Link to comment
3gunDQ Posted December 22, 2016 Author Share Posted December 22, 2016 My CMC wont run in my PSA (piece of shit armory) carbine with their BCG... wont work, not reliable at all. I have a friend with a different PCC and different trigger (same model CMC) and his wont run either. I put my PCC CMC in a AR-15 rifle and it runs like a sewing machine.... maybe I got a PSA dud? very possible. Link to comment
robertg5322 Posted December 22, 2016 Share Posted December 22, 2016 My CMC no bueno in my 9mm ATI carbine. RRA 2 Stage NM trigger works fine. I believe it has to do with the profile of the hammer and how it interacts with the bolt. Won't go back far enough to catch the disconnect or. I suppose if one wanted to they could weld up the front top corner of the hammer and recontour it. Go figure, Link to comment
Shadowrider Posted January 2, 2017 Share Posted January 2, 2017 Don't feel too bad. Geissele doesn't work either. JP Bolt here... Link to comment
1911luvr Posted January 2, 2017 Share Posted January 2, 2017 My CMC no bueno in my 9mm ATI carbine. RRA 2 Stage NM trigger works fine. I believe it has to do with the profile of the hammer and how it interacts with the bolt. Won't go back far enough to catch the disconnect or. I suppose if one wanted to they could weld up the front top corner of the hammer and recontour it. Go figure,I'm running the POF 3.5lb single stage flat trigger in my ATI, and it works perfectly so far. Sent from my iPhone using Tapatalk Link to comment
mscott Posted January 2, 2017 Share Posted January 2, 2017 I had issues with the CMC in a past rifle, so haven't even considered one of those. I tried a RRA NM Varmint trigger and wouldn't ignite primers with the JP bolt, but never tried the 4.5# version. I have a Geissele SSA-E in one lower and works with everything. Hyperfire in one lower and has worked with everything so far. I have a regular mil-spec trigger that came with the parts kit that I trimmed the hammer hook from and use JP yellow springs that hasn't missed a beat yet. I have 3 bolts; a JP, Spinta Precision, and Kaw Valley and haven't found any of them to be more sensitive than the others. Link to comment
cas Posted January 3, 2017 Share Posted January 3, 2017 Isn't this a ramped / not ramped bolt carrier issue? (I haven't messed with pistol uppers in many years so its all fuzzy memory) Link to comment
Todd7446 Posted January 3, 2017 Share Posted January 3, 2017 11 hours ago, cas said: Isn't this a ramped / not ramped bolt carrier issue? (I haven't messed with pistol uppers in many years so its all fuzzy memory) Yes, that's exactly it. The hammer was designed for .223/5.56 bolts, and the ramped 9mm bolt doesn't always drop the hammer enough to reset it. Link to comment
Rub'n Posted January 3, 2017 Share Posted January 3, 2017 I just got a PSA .... Glock style. Put a Hyperfire 24C in....couldn't be happier. almost went with the CMC... glad I didn't. Link to comment
watlow Posted February 16, 2017 Share Posted February 16, 2017 Great....I'm a PSA with a CMC guy and seeing the same issues.....anyone got a bullet proof trigger for a PCC? Thanks for any help Link to comment
Gary Stevens Posted February 16, 2017 Share Posted February 16, 2017 2 hours ago, watlow said: Great....I'm a PSA with a CMC guy and seeing the same issues.....anyone got a bullet proof trigger for a PCC? Thanks for any help JP bolt and JP trigger assembly. Link to comment
3gunDQ Posted February 16, 2017 Author Share Posted February 16, 2017 6 hours ago, watlow said: Great....I'm a PSA with a CMC guy and seeing the same issues.....anyone got a bullet proof trigger for a PCC? Thanks for any help I put a hiperfire in mine and it has been 100% ever since my CMC woes. Link to comment
Darqusoull13 Posted February 16, 2017 Share Posted February 16, 2017 10 hours ago, watlow said: Great....I'm a PSA with a CMC guy and seeing the same issues.....anyone got a bullet proof trigger for a PCC? Thanks for any help I'll second the JP PCC trigger with JP internals. I initially went with the JP because the trigger was both good and reliable. No regrets since and I'll be building a 2nd JP now that the GMR-15 is out. Link to comment
bwikel Posted February 16, 2017 Share Posted February 16, 2017 11 hours ago, watlow said: Great....I'm a PSA with a CMC guy and seeing the same issues.....anyone got a bullet proof trigger for a PCC? Thanks for any help I'm running a Timney 3 lb. trigger in my ramped bolt AR9 and have over 3k thru it with no issues. Link to comment
Mx556 Posted February 16, 2017 Share Posted February 16, 2017 I'm running a 2-2 Timney with a JP bolt 100%.... Link to comment
dgreen Posted February 16, 2017 Share Posted February 16, 2017 Spinta bolt, RRA NM 2 stage. No issues. Link to comment
1911luvr Posted February 16, 2017 Share Posted February 16, 2017 ATI bolt and POF flat trigger here, and no issues. Sent from my iPhone using Tapatalk Link to comment
corny Posted February 17, 2017 Share Posted February 17, 2017 The belly of the 9mm bolt is shallower than a 5.56 bolt. A piece of tool steel needs to be silver soldered to the hammer adding about 5-10,000 to it. This will make it reliable. 15% silver solder. My CMC and Hipefire 24C both work in my AR 9mm carbines without the added metal but will fail to reset 1 or 2 times per match. Link to comment
outerlimits Posted February 17, 2017 Share Posted February 17, 2017 8 minutes ago, corny said: The belly of the 9mm bolt is shallower than a 5.56 bolt. A piece of tool steel needs to be silver soldered to the hammer adding about 5-10,000 to it. This will make it reliable. 15% silver solder. My CMC and Hipefire 24C both work in my AR 9mm carbines without the added metal but will fail to reset 1 or 2 times per match. this Link to comment
Aircooled6racer Posted February 17, 2017 Share Posted February 17, 2017 Hello: I also think there is other issues here as well. Not all upper receivers are made to the same dimensions. I have checked out 6 so far and the bore to the matting surface is different on some of them and is slightly higher up which would compound the reset problem. This could be also true for the lower receivers as well. Thanks, Eric Link to comment
tact Posted February 17, 2017 Share Posted February 17, 2017 ^^This. Rolling the dice on crap quality inherently leads to these sorts of issues. Link to comment
Alvin Posted February 17, 2017 Share Posted February 17, 2017 I'm running a jp trigger but added a .040 bump (tight welded)on the underneath portion of the bolt to make it 100%. Put a hipper fire 24c in my last build and never had any trouble with it Link to comment
corny Posted February 17, 2017 Share Posted February 17, 2017 3 hours ago, Alvin said: I'm running a jp trigger but added a .040 bump (tight welded)on the underneath portion of the bolt to make it 100%. Put a hipper fire 24c in my last build and never had any trouble with it Yup Link to comment
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