Doing a thought exercise on a potential AR9 “pistol” build and debating the merits of a Glock mag vs a Colt/Uzi mag setup. I’d be using an extra 5.56 receiver with a mag adapter and a standard upper receiver. Planned use would just be range fun, not a work gun or anything close to serious gaming.
Looking at various vendors it looks like the Colt-style adapter is less expensive than the Stern Defense Glock adapter. Glock mags are less expensive plus they’re easier to find locally and online but the steel mags should theoretically have a longevity advantage. I’m not sure if the Colt-style mags have an advantage in feeding since they run straight up and down vs Glock mags needing to be at the proper angle. Bolt prices seem to be a wash.
Thoughts based just off the above choices?
Thanks!