Perfect function - Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter

There are so many parts being sold today that are just gimmicks or of such poor quality that a person can't help but be skeptical. But I'm happy to report that the Stern adapter did not disappoint. I have had zero malfunctions after running many rounds of both ball and defensive ammo. It also has not failed to lock the bolt back on the last round. This is currently on a RRA LAR15 lower with a PSA 8" AR9 upper. I'd give it 6 stars if I could.