I'm a low roller, so I purchased an ATI Commander model. It is the GI version. Shot 115gr well. Changed out to a full guide rod. Started having issues, but I also changed over to 124 gr ammo at the same time. The gun started jamming, so I switched back to 115gr. No issues with that weight bullet. I prefer 124gr ammo, so I just couldn't accept the 1911 only shooting 115gr ammo. I changed out springs, but it didn't work. Finally, I obtained a variable recoil spring- from Wolff springs- (the first replacement was conventional), and wallah, it fires without jamming. I have several other ATI's but they are all 45acp firearms. No issues whatsoever with that caliber. The 9mm on the other hand, needed some work. Still for 379.00, I don't regret it one bit. Especially since, with the mods it's still less than 410. Plus,I like to tinker with stuff.