I bought the complete 5" FM9 glock upper and put it on a new Anderson AM9 lower. The cut on the bottom (ramp) of the FM9 BCG is too low and not functional with the lower's LRBHO bolt catch (she's too thicc). Removed LRBHO and hand cycled 3 rounds to make sure I was going to keep the lower. It cycled flawlessly.

So, I ordered Anderson's AM9 bcg and now everything works, including LRBHO. Now I have a BCG I can't even use.

The complete upper (incl. BCG) was test fired by FM IIRC, but it showed up clean. Like I said, IIRC.

Obviously because I believed I was installing the upper to run it, I oiled the BCG, like you do.

So, it may have been test fired by FM QC Personnel, it hand cycled 3 rounds, and was oiled. Never dropped, taken apart, or fired by me, never installed in any other upper.

Sale is for take-off BCG only.

You know as much as I do now.

Hshawn419 fm9 glock BCG new take-off https://imgur.com/a/kjdN8ds