Well, the TAPCO front sight tool did not fit my BCM front sight pin at all. I'm just glad it was only $6-7 instead of the $15-20 I've seen elsewhere. I ended up using the tip of a FMJ round to push the pin down and start the rotation. Maybe this was already common knowledge, but the FMJ tip works perfectly for adjusting the front sight. Wanna kill these ads? We can help!