Thread: DIY adjustable gas block

After I fitted a DPT suppressor to my CMMG Ar15 I was surprised how much gas blowback I was getting, both out the bolt and rear of the charging handle. I had noticeably more recoil and the sound reduction was decreases by the obvious noise coming out of the upper. Due to a lack of adjustable gas blocks for what I would call a reasonable price I decided to make my own, if I wrecked mine I'd just replace it with a new adjustable one.

$7 later from the Engineering Supplies shop I had a 4mm grub screw, 4mm tap and appropriate size drill. Clamped it into my drill press vice and very carefully drilled until it had just cleared the other side of the gas transfer port, carefully tapped the thread and screwed the grub screw in with a bit of thread tape.

Had a play over the last few weeks to get it set as I started with it all the way out and steadily screwed it in, still haven't had it fail to cycle and it's almost bottomed out so I'll locktite it where it is.
Other than the $5 foam from Para Rubber glued onto the terribly uncomfortable Spears stock it's the best mod I've done