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Posted: 8/22/2013 8:38:29 AM EDT
| Got a CMMG .22 upper and tried it out for first time. Wouldn't fire (very light primer strikes). I had put it on a lower with no buffer/sping since it seemed like it isn't needed as it is all contained in the bolt assembly in the upper. Took buffer/spring out of another AR and put it in and it worked fine. Do I need to use a buffer to hold the inner bolt assembly up against the barrel? |
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Same situation with mine. In short, yes, it needed a buffer to keep the 22 bolt held into place properly. I have a buffer spring, buffer, and this little jewel: Though I suspect this would work, as well: http://www.spikestactical.com/new/z/st22-pistol-plug-p-70.html Once I played with the .22 bolt assembly, and saw that it could move back and forth a bit, I realized the need to keep pressure on it, to keep it in place. |
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Quoted:
Same situation with mine. In short, yes, it needed a buffer to keep the 22 bolt held into place properly. I have a buffer spring, buffer, and this little jewel: [url=http://www.midwayusa.com/product/963085/taccom-pressure-plug-ar-15-22-long-rifle-conversion-reliability-enhancement]http://www.midwayusa.com/product/963085/taccom-pressure-plug-ar-15-22-long-rifle-conversion-reliability-enhancement[/url Once I played with the .22 bolt assembly, and saw that it could move back and forth a bit, I realized the need to keep pressure on it, to keep it in place. I'm using that little black plug in front of my buffer also with my CMMG upper and reliability has been flawless so far. http://i1017.photobucket.com/albums/af295/BRL10/001.jpg |
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Quoted:...no buffer required Sounds to me like you can do without the buffer and save a few bucks. I just shoved the plug in front of my buffer so I'd know where it would be if I decided to swap out the .22 LR upper for my 5.56 upper. Hopefully I'll remember to remove the plug if I do swap uppers. 
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Quoted:
Sounds to me like you can do without the buffer and save a few bucks. I just shoved the plug in front of my buffer so I'd know where it would be if I decided to swap out the .22 LR upper for my 5.56 upper. Hopefully I'll remember to remove the plug if I do swap uppers. Quoted:
Quoted:...no buffer required Sounds to me like you can do without the buffer and save a few bucks. I just shoved the plug in front of my buffer so I'd know where it would be if I decided to swap out the .22 LR upper for my 5.56 upper. Hopefully I'll remember to remove the plug if I do swap uppers. I don't believe a 5.56 upper can be fully charged w/ that plug in there, I'll try it later tonight. |
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Tim makes good stuff |
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Nice. Thanks for pointing that out. |
Here is a public SAFETY NOTICE!!!!! 
TACCOM totally recommends that you put the pressure plug in front of the buffer......do NOT remove the buffer. ESPECIALLY if you are swapping between 223 uppers and 22lr uppers. Our reasoning is that IF you were to forget to remove the PP when you put your 223 upper on.....you will be kindly reminded to remove it, the first time that you try to charge your weapon. The bolt will not come back far enough to pick up a round out of the magazine. A nuisance? yes.....Safe? absolutely!! If you merely put the PP in front of the spring (no buffer) and swap back and both between 223 and 22lr and forget to exchange the PP for the buffer when you put the 223 upper on.....BAD THINGS CAN HAPPEN!!!!!! Your bolt carrier could destroy your lower and HURT you!!!!! Again.....the pressure plug is a good thing for 22lr and we recommend that you install the PP in front of the buffer. Thank you Tim |
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Now I'm laying here thinking about what Tim said. Maybe I need to dump the weights out of a buffer and screw/ epoxy the plug to the empty buffer face. Truth be known....for the AR15 (not M16 ro M4 machine guns)......you can run a buffer with no weights at all. Tim |
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Truth be known....for the AR15 (not M16 ro M4 machine guns)......you can run a buffer with no weights at all. Tim Quoted:
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Now I'm laying here thinking about what Tim said. Maybe I need to dump the weights out of a buffer and screw/ epoxy the plug to the empty buffer face. Truth be known....for the AR15 (not M16 ro M4 machine guns)......you can run a buffer with no weights at all. Tim I'm not worried about myself but if someone else were to swap my uppers it might be interesting. I tried tis morning and with a mil spec carbine tube the pp and spring wouldn't allow the bolt to move far enough to the rear to strip a round off the mag. Problem is one of my 22s uses a rifle length buffer tube and stock. |
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Thanks for that link, I didn't even know those plugs existed.  Just ordered three... |
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Taccom, what are the three washers that are included in the firing pin? I installed the reliabilitiy kit in my dedicated CMMG upper. Couldn't see where those rings would be used. Not sure if that is just something used for "drop-in" conversions and wouldn't apply to an actual .22LR upper?
Even with the kit, had a LOT of problems (mainly not going into battery). Have about 300 rounds through it, and it seems to be getting better (hopefully just not broken in yet) and gave it a real good clean/lube so we'll see how it does next time... I had a real hard time even pushing the bolt closed with my thumb, so I hope it was a dirty chamber, but it was doing that even with the first couple rounds (after a cleaning) |
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Taccom, what are the three washers that are included in the firing pin? I installed the reliabilitiy kit in my dedicated CMMG upper. Couldn't see where those rings would be used. Not sure if that is just something used for "drop-in" conversions and wouldn't apply to an actual .22LR upper? Even with the kit, had a LOT of problems (mainly not going into battery). Have about 300 rounds through it, and it seems to be getting better (hopefully just not broken in yet) and gave it a real good clean/lube so we'll see how it does next time... I had a real hard time even pushing the bolt closed with my thumb, so I hope it was a dirty chamber, but it was doing that even with the first couple rounds (after a cleaning) The rings are for adjusting the firing pin protrusion. Email Tim and he'll explain everything he builds. Or call. His customer service is top notch. |
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Who's bolt assy do you have? CMMG?
If it is closing hard....is that with or with out a round? If it is without a round.....you have MAJOR issues. If it is with a round, then you have issues with the extractor 'hook' clearance. If you've exhausted every option....send it to me....I'll give it a run through and give you some answers....maybe even fix it. Tim |
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Tim, thanks for reply.
CMMG bolt (complete CMMG "Wasp" upper, including charging handle). Only hard to close with a round trying to chamber. I ran about 75-100 rounds and had a number of feeding and extracting issues. C leaned, lubed and put your kit in. Still had issues feeding, one or two times I couldn't extract a round (but could close bolt on it again and fire it, then they extracted). Ran about 125-150 rounds (so probably less than my original 300 estimate). Just cleaned again, as well as "buzzed" the ramp and chamber with a brush. I think it needs more break-in (wasn't trying to imply your kit was bad, it had more issues before). Also, what are the three washers that come with firing pin? My CMMG bolt doesn't seem to have anything like that. |
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Quoted:
Here is a public SAFETY NOTICE!!!!!
TACCOM totally recommends that you put the pressure plug in front of the buffer......do NOT remove the buffer. ESPECIALLY if you are swapping between 223 uppers and 22lr uppers. Our reasoning is that IF you were to forget to remove the PP when you put your 223 upper on.....you will be kindly reminded to remove it, the first time that you try to charge your weapon. The bolt will not come back far enough to pick up a round out of the magazine. A nuisance? yes.....Safe? absolutely!! If you merely put the PP in front of the spring (no buffer) and swap back and both between 223 and 22lr and forget to exchange the PP for the buffer when you put the 223 upper on.....BAD THINGS CAN HAPPEN!!!!!! Your bolt carrier could destroy your lower and HURT you!!!!! Again.....the pressure plug is a good thing for 22lr and we recommend that you install the PP in front of the buffer. Thank you Tim ^^^ This. BTW Tim is one of best industry guys I have ever had the pleasure of talking with. |
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Also, what are the three washers that come with firing pin? My CMMG bolt doesn't seem to have anything like that. They are shims.....the instructions clarify how to use them. I'd cut and paste that in here, just not at my work computer at the moment. Having the firing pin sticking out to far is a bad thing as it can possibly damage your barrels chamber. Tim |
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I just use a normal weight carbine buffer for my CMMG 22LR upper. Never had an issue yet. Shot all sorts of stuff out of it, and no issues with feeding or light primer strikes. There are others that run like yours too.....but there are things like manufacturing tolerances, which is why some people have issues.....the other issue is that even if it works 100%, there is a matter of cushion. I'm going to assume that you've shot 1000's of rounds thru your rifle so far. Take a look at the area on your lower where the CMMG insert is constantly pounding.......what you are to see is an area about .4" wide that the anodizing looks a little different, that is wear, that is the begining of a dent. It's not a big deal....will probably never break....HOWEVER....when steel comes up against aluminum......steel typically wins. I like having a little more cushion so I can keep that pounding to a minimum. The PP adds about 7 extra pounds of force in the form of a cushion. Tim |
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They are shims.....the instructions clarify how to use them. I'd cut and paste that in here, just not at my work computer at the moment. Having the firing pin sticking out to far is a bad thing as it can possibly damage your barrels chamber. Tim Quoted:
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Also, what are the three washers that come with firing pin? My CMMG bolt doesn't seem to have anything like that. They are shims.....the instructions clarify how to use them. I'd cut and paste that in here, just not at my work computer at the moment. Having the firing pin sticking out to far is a bad thing as it can possibly damage your barrels chamber. Tim Tim, thanks again for your responsiveness I'll re-read the instructions, I was kinda in a hurry to ge the gun ready so I stopped reading after "put the new pin in" 
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How can the buffer contact the end plate with the buffer pin in place? The bolt rides on rails welded to the endplate that is on the front side of the pin. So how does the buffer put pressure on the backplate? It doesn't, that's why Taccoms plug is shaped like is. |
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Tim, what does your cf stock have? The buffer? ME??? I use an ACE Butt Stock on one lower, a CTR on another, A1 on another, couple of Cav Arm lowers with the Butt Stock built in, another has a std carbine BS.....pretty much all over the board I guess. SOme have rifle buffers, other are carbine buffers....and ALL my buffers have the weights removed (I don't shoot or have FA rifles). Tim |
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