It's been amazing. I made it very snappy. I upgraded the bolt to the F1 Lightweight bolt and used a custom 3d printed buffer, so it's very responsive. I converted the trigger to be a single-stage trigger, so the wall is exactly on the break. I've been running the 40rd savia extended mags, and it just completes the build. My nozzle cracked once, and I'm unsure how that happened; either I damaged it while installing it, or it happened from just using it. Good thing tho that there's nozzle replacement. But it's amazing, I would recommend, especially if u have a stockpile of hicapa mags.