Gun Build Constructive Criticism

[KakarikoCitizen]

Over the past two years or so I've been slowly upgrading my gun and hope to eventually achieve a long range build similar to a DMR but still retain full auto. My base gun (dont h8) is a G&G Combat Machine with PBB. It was some ASGI custom bs with a Madbull Dragonfire 7" handguard and slightly upgraded internals I guess. I've put an m120 (I think, it was from an upgraded JG AK I bought off a guy that broke) I need to work on compression but right now Its shooting about 370-380 FPS with .25s at about 23 RPS. I would like to get up to about 425 FPS but my compression is crap currently. I have a polycarb piston with 3 metal teeth in the back and I've shimmed my GB to perfection, a JG Blue motor, 509mm 6.03 barrel, random bucking (need suggestions) and a stock hop-up. I have a 4" barrel extension I could pair with that 8" mock suppressor if I could find a 610mm tightbore somewhere, how would that affect accuracy\range?

[vulrath]

First, the prodigal user returneth.

Second, fix the compression first. That's going to help you most of all. It's been a while since I messed with AEGs, but if I recall the length of the barrel doesn't matter past 250mm. After that it's the quality that matters. Spring for a Prometheus or PDI barrel. They're expensive for a reason.