I use a Stern adapter in my truck gun.
Works flawlessly.
Decided on it when GLock lowers were unavailable just about everywhere.
Prefer a pistol caliber that takes same magazines as my carry gun.
I know some people would advise me to use a .556, but I'm not trying to fight off an army or go on the offense, my truck gun is to just get me out of a jam.
Oh, and it makes it easy for my wife to shoot it also.
RCA