I'm mostly running my G3 G20 with Lonewolf after market barrels. I got them because the better supported and tighter chambers were supposed to be lighter on the brass for reloading. The chambers are tighter for sure. Just rattling a cartridge around in unmounted barrel confirms that. I'm not so sure about the chamber support though. They look pretty darn close to OEM to me. (OEM to the left). Of course on the photo with the OEM being black it's hard to tell... And indeed, some times I have problems chambering my reloads in the aftermarker barrels. I'm assuming those were previous hotter loads with some bulging. Anyone with similar or different experience, from LW or other aftermarkets, Barsto, KKM. Cheers!