Long time Glock shooter, and holster manufacturer based originally out of Colorado, and now Idaho. Have quite a few Glocks, but carry and shoot the G19 the most. Just got this back from Kazz in Florida. Slide assembly weighs 1lb even after machining. The stock Gen4 slide assembly is 1lb .7oz by my scale, so it's lighter after installing the RMR. Cannot wait to train with it this next year.