Forgot to mention about possible nozzle seal leaks in the ACR.
Can always try out the old “o-rings in the t-piece” trick and see if your FPS improves dramatically from there? 
Aaaaah… that’s better.
Consistently just under 300FPS… Amazing what running the right spring will do. Full M100 
Happy with that, now to work on a barrel stabilizer and it’s done. Then what am I gonna do? 
2 Likes
Go out and pew pew to your hearts content and enjoy mate! 
PS: Love the ACOG, looks exactly the same as the genuine Alloy one on my Bushmaster DMR. 
Go farming like me, plenty to do haha