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Your bolt release catch spring from your factory gun is to stiff. If you didn't receive a spring with your BHOA part then you should try to get one from CMMG. If you did receive that extra spring, it goes to the release. The looser spring improves everything. Also, my understanding is that the bolt won't hold open if the magazine isn't in place when the charge handle is pulled back. Hope this helps if you haven't figured this out already.
Heya, I have a Plum Crazy Polymer lower as well, the plum crazy lower flexes slightly making the BHOA not work. I put it in my normal aluminum upper/lower and it works just fine.
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Your problem is yoiur long ass finger nails
Did the mag come with the bhoa you can buy compatible mags for it or modify your mag to work with it
Your bolt release catch spring from your factory gun is to stiff. If you didn't receive a spring with your BHOA part then you should try to get one from CMMG. If you did receive that extra spring, it goes to the release. The looser spring improves everything. Also, my understanding is that the bolt won't hold open if the magazine isn't in place when the charge handle is pulled back. Hope this helps if you haven't figured this out already.
Heya, I have a Plum Crazy Polymer lower as well, the plum crazy lower flexes slightly making the BHOA not work. I put it in my normal aluminum upper/lower and it works just fine.