We all know that Glock developed the GAP to fit their 9mm/40 sized guns... has anyone else realized the other economies of shooting both rounds. (These come from shooting a G19 and a G38) Guns: Same frame size and grip. Same site radius. Ammo: 9mm nice and cheap for practice - 45 gap nice and powerful for carry. Holsters: Almost the same fit - G19 a little looser in hard holsters but fit well in leather. Mag Holder: Same size. Reloading: this is where I think 45 GAP really pairs well with 9mm... both use small pistol primers. So unlike reloading 45 ACP I don't have to stock two types of pistol primers. Recently I also upgraded to a Horndady L-N-L with an auto powder dispenser and because the 45 GAP case is the same height as the 9mm, I don't have to adjust the activation mechanism when switching calibers - just the powder charge. Nice! Anyone find anything similar between the 45 GAP and 9mm (or other calibers you shoot for that matter)? Wanna kill these ads? We can help!