G34 Gen4, I bought as is, except the DPP. It has an aftermarket 3.3# trigger. Rounds are 124g RMR, CCI 500 & 5g CFE Pistol. 1)- I just discovered why some brass is landing to my right, and some is landing directly in front of me. Some of the brass is beating the crap out of my new DPP sight I don’t know what the recoil spring poundage is, these are the only markings I can find. 2)- There’s a build up of grime and unburned powder build up. After 20+ years of handloading 40 S&W Glocks I’ve never seen unburned powder & this much grime after a couple hundred rounds in a Glock. What are your thoughts?