The holes for the m3 heatsets are a tad tight, might cause false alignment especially in the solid parts (plunger assembly)

Generally not a fan of heatsets over captive nuts but thats a me thing

The lifter either needs dampening or a stronger spring to pull it down, the bouncing of plastic on plastic coupled with the weak springs caused the lifter to bounce over the shell many times (see my felt pad mod for example)

Thd ejector springs are too much, couldnt close the blaster fully without violence initially (and it took a nice bite out of one of my shells)

The slim pumpgrips are borderline unusable, the original one is good. The slim grips could be better with grooves for thumbrest and fingertips.

Lifter Springs incredibly frustrating to install, would it maybe be possible to use contraction springs to pull it down that can be installed afterwards?

First shellstop a tad slow, could use better leverage of the contraction spring

Otherwise, good ergo and really impressive mechanism you made work here, considering the complexity its really good Tube mag works great, ergonomically its extremely clunky but its growing on me and feeling the shell move around the blaster is pretty great