Just got my first one, so take my opinion with a grain of salt. Picked up a B&T print-xh rbs in .223 and am quite pleased with it. Little to no gas, quieter than I expected, especially compared to my buddy's Q Jumbo Shrimp. I'm sure there is a little POI shift, but haven't gotten that far with it yet. I've only used it on a 16" AR, as waiting for adapter for my rifle.