As much as I have enjoyed shooting my 9mm-converted 5.56 lower, which uses a magazine well block insert to allow it to accept Colt-style 9mm stick mags, I definitely prefer normal pistol magazines and a lower designed specifically to accept them. Although, yes, this limits you to pistol calibers, it also reduces failure points, extra parts, and time spent tinkering and adjusting to get everything working properly. For much of this year I’ve casually kept my eye out for a dedicated 9mm AR-15 lower receiver that accepts GLOCK or other pistol magazines, and when Lone Wolf‘s G9 became available again I decided to pull the trigger and give it a shot.