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Rimfire Firearms .22, .17 and other Rimfire Handguns and Rifles

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  #1  
Old 10-02-2012, 10:14 AM
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Zartan Zartan is offline
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Question Problem with my .22 AR build....**UPDATE: Test fire issues**

So I built an 80% .22 AR in another thread with a CMMG dedicated upper. I finally got to take it to the range to try it out. Loaded my black dog 10 rounder with Winchester M-22. Chambered a round, fired, ejected, chambered next round and the FCG did not reset. If I want to fire again, I have to rack the charging handle again which ejects a live round, chambers another and cocks the hammer.

Same results with CCi Stingers and Federal Bulk.

What could the problem be?
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Last edited by Zartan; 10-09-2012 at 4:34 AM..
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Old 10-02-2012, 10:24 AM
nothing4u nothing4u is offline
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Did you lube the rail?
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  #3  
Old 10-02-2012, 10:32 AM
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What trigger did you use?
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Old 10-02-2012, 10:44 AM
NorCalDustin NorCalDustin is offline
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So you Fire a round, the brass ejects, it loads a new round into the chamber?

Then you try to fire... Does the firing pin then hit the rim of the 2nd round? or does it not release the hammer?

Is the bolt fully closed when the new round is chambered after a round is fired?

Is the bolt lubricated?

Are you using a special trigger or hammer?

Also... I would recommend you check your FCG & especially disconnector... I suspect this kind of behavior on a .22LR setup would probably manifest itself in another manor on a centerfire upper. You might even take the rimfire upper off, and do a full function check of the lower.
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Old 10-02-2012, 10:50 AM
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Quote:
Originally Posted by nothing4u View Post
Did you lube the rail?
No

Quote:
Originally Posted by Intimid8tor View Post
What trigger did you use?
Stock trigger from my DPMS LPK

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Originally Posted by NorCalDustin View Post
So you Fire a round, the brass ejects, it loads a new round into the chamber?
Yup

Then you try to fire... Does the firing pin then hit the rim of the 2nd round? or does it not release the hammer?
Nothing, the hammer isnt cocked after the 1st round ejects

Is the bolt fully closed when the new round is chambered after a round is fired?
Yup

Is the bolt lubricated?

Are you using a special trigger or hammer?

Also... I would recommend you check your FCG & especially disconnector... I suspect this kind of behavior on a .22LR setup would probably manifest itself in another manor on a centerfire upper. You might even take the rimfire upper off, and do a full function check of the lower.
What does a full function check entail? I took the upper off, cocked the hammer, squeezed the trigger and it the hammer released.
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  #6  
Old 10-02-2012, 11:47 AM
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Drive down to Tracy Rifle and Pistol, have Mike check it out.
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Old 10-02-2012, 12:19 PM
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Drive down to Tracy Rifle and Pistol, have Mike check it out.
You read my mind their Bob
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Old 10-02-2012, 12:27 PM
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Make sure your hammer is not notched, and are you using a CMMG "BHOA" bolt hold open actuator? It may be keeping the next round from feeding properly with Black Dog mags...
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Old 10-02-2012, 12:35 PM
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Make sure your hammer is not notched, and are you using a CMMG "BHOA" bolt hold open actuator? It may be keeping the next round from feeding properly with Black Dog mags...
When I bought the upper, the BHOA was an option and after a bunch of searching, the BHO doesn't work without extensive mods, and even then might not always work, well with non-evolution mags that is. So I did not get the BHOA.
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Last edited by Zartan; 10-02-2012 at 12:37 PM..
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  #10  
Old 10-02-2012, 1:27 PM
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Here...read your heart away....

http://www.ar15.com/forums/t_3_15/52..._pictures.html
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Old 10-02-2012, 1:54 PM
NorCalDustin NorCalDustin is offline
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Here's a video on doing a function check:
https://www.youtube.com/watch?v=ustbjp2bpFw

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Make sure your hammer is not notched, and are you using a CMMG "BHOA" bolt hold open actuator? It may be keeping the next round from feeding properly with Black Dog mags...
I dont think thats the issue... Normally it will cause extraction issues.
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Old 10-02-2012, 2:31 PM
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Just to be clear. Is the hammer following the bolt down after you shoot. In other words is it not cocking the hammer?
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Old 10-03-2012, 4:49 AM
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Quote:
Originally Posted by uxo2 View Post
Awesome thread, thanks

Quote:
Originally Posted by NorCalDustin View Post
Here's a video on doing a function check:
https://www.youtube.com/watch?v=ustbjp2bpFw
Sweet, I'm good there
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Originally Posted by AR22 View Post
Just to be clear. Is the hammer following the bolt down after you shoot. In other words is it not cocking the hammer?
That is correct
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  #14  
Old 10-05-2012, 6:30 AM
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So, in my over enthusiastic lower assembly, it appears I forgot the disconnector spring. Function check is now A-ok and will be test firing tomorrow. Flame on!

Oh, before I found the missing spring, I mirror polished the feedramp.
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  #15  
Old 10-05-2012, 8:18 AM
NorCalDustin NorCalDustin is offline
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lol... I thought the function check was okay before? lol...

To be fair... I thought you had it in there, just upside down. ---Honestly, stuff like this happens all the time. Don't feel bad.
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  #16  
Old 10-05-2012, 8:23 AM
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Quote:
Originally Posted by NorCalDustin View Post
lol... I thought the function check was okay before? lol...

To be fair... I thought you had it in there, just upside down. ---Honestly, stuff like this happens all the time. Don't feel bad.
I failed the function check too, then I watched again...
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  #17  
Old 10-09-2012, 4:33 AM
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Okay,so I took my rifle to the range on Sat and it fired good. Actually after the first 4 rounds or so, I get a light strike. I chamber a new round and sometimes it will fire, sometimes it will light strike. Rather annoying. I was using m22 and stingers, no difference in either. The firing pin looks ok. I'll try and post pictures of the rounds if my camera can focus on it.
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  #18  
Old 10-09-2012, 11:02 AM
NorCalDustin NorCalDustin is offline
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Also post pictures of the bolt face, the collar w/ the feed ramp, and of a casing...

1) Check that the Firing pin moves freely in the bolt...

2) Are you using a standard FCG?

3) Your hammer spring is installed correctly?

4) Do you happen to have a buffer spring/buffer installed? It shouldn't be needed but some people say it helps keep the bolt more stable.
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  #19  
Old 10-10-2012, 10:42 AM
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Ooookkkkkkkk.......

I would re-read that link
on arfcom.

And maybe call cmmg.
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