Presuming the bolt catch came with the cmmg kit?
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Presuming the bolt catch came with the cmmg kit?
Yes
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My experiences with CMMG were very poor and I would not recommend any of their products to anyone.
1. If you have another tried and true lower, switch the upper to it and see if you have the same problem.
2. Check this thread to see if this is your problem:
https://www.m4carbine.net/showthread.php?t=125545
When you lock the bolt back manually, it can be released by pulling back on the charging handle.
There is nothing wrong with your build.
Show a picture of the lower and the bolt catch