Not sure if this is the right forum - looking to take 5 minutes or less to try someone's 9mm BCG in my AR to see if my BCG is bad from the factory...preferably somewhere on the I90/405 east corridor. I purchased new as pieces a 9mm upper/lower and (KAW Valley) BCG, for a Glock/mag setup. The mags jam in place when assembled requiring a good blow with a rubber mallet to dislodge/release. They release as expected with KAW BCG removed. Getting the runaround from KAW about them sending me a replacement. If anybody has another I can briefly try and see if (Glock) mags release as expected, I'd be grateful.