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Posted: 9/2/2012 12:07:01 PM EDT
| I have a CMMG .22 upper on a Spikes lower. Runs great with Federal bulk, no feeding or ejection issues at all. The last couple times out though, something is going on with the safety. The selector doesn't move but I feel the safety engage and disengage between shots, causing serious delays in the hammer falling. Sometimes, I have to turn the selector to safe and then back to fire to get the hammer to fall. It has a CMMG lower parts kit, the only thing I changed was the hammer and trigger springs. I put a set of JP yellow springs in there. They have been in since the beginning and were working fine. Friday, I changed out the safety, detent and spring with a set from a PSA lpk I have laying around for another build. Went to a steel match today, same problem. Could the JP springs somehow be causing this issue? Also, I do notice that when I turn the selector to safe, there is no positive click like on my 5.56 AR. |
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Quoted:
1) Does the rifle pass a function check? 2) Is it cleaned and properly lubricated? Specifically check for a blown primer. Passes function check. Like I said though, there is no positive click when engaging safety. Cleaned and lubed. It's a rimfire upper. The lower has never been on a centerfire upper. So, no blown primer. |
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Quoted:
Quoted:
1) Does the rifle pass a function check? 2) Is it cleaned and properly lubricated? Specifically check for a blown primer. Passes function check. Like I said though, there is no positive click when engaging safety. Cleaned and lubed. It's a rimfire upper. The lower has never been on a centerfire upper. So, no blown primer. Remove the pistol grip, pull it off the lower receiver with the selector spring still in the grip channel, and make sure that that selector detent is still in the channel above the spring. From there, it comes down to if the selector detent is in the channel, then is it binding in the step channel, or not seating high enough in the channel to make positive contact with the selector. If needed, you may have to clean up the step channel a bit. The smaller through channel is 1/8", while the bottom larger step of the channel is 9/64. If with the receiver selector detent channel cleaned up, the selector detent pin still does not fit (should drop in and fall out of the channel), then a replacement selector detent pin that is correctly produced will be needed to replace the defective over size unit. http://www.ar15.com/content/guides/assembly/lower/ 
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Quoted:
Took it apart, ran a pipe cleaner through it and then some compressed air. Also gave the spring a good tug to slightly stretch it out a little. Definitely has a more positive click now. I'll take it out sometime this week and see if it has any more trouble. Let me guess, After market pistol grip, and the spring channel in it is too deep???? Is so, find something to fill in the bottom of grip channel to correct the too deep of a spring channel (piece of Q tip should work as a temp solution). Stretching the spring is not going to last (will just go back to the correct set), so it comes down to filling in the bottom of the too deep channel, or getting a correct depth spring channel grip instead. |
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