Cotton Arms Adjustable Gas Block - .750"
This Cotton Arms Adjustable Gas Block is precision machined for AR-15/M4 pattern firearms. The end of the adjustment screw pocket is deliberately left unfinished on the last ½ turn. Upon adjustment, this unfinished half turn imparts a bite, eliminating the need for applying thread locker or gimmicky mechanisms.
- Precision machined
- 4140 chrome moly steel
- Black oxide 5/64 Allen head set screw
- 0.309” 3/32” Allen head adjustment screw
- Inner diameter: 0.752”
- Wall thickness: 0.1615”
- Length: 1”
- Height: 1.345”
- Gas port diameter: 0.181”
Ratings & Reviews
Cheap but it simply worked for me
by Chris -
After seeing the posted review I got nervous as I hadn't shot my rifle with this block on it since finishing the build several months ago. Didn't need to worry. I am running a lightweight BCG, and 1oz recoil system so the block was adjusted to be barely open and I had no issues. After the first 20 shots had to open a little more to account for build up but otherwise worked perfect. The no set screw wasn't an issue as my dialed in setting stayed out and didn't walk out. For the money it'll do the job.
by Josh -
Bought this due to price. Installed it and it quite literally blew up on the first shot. The adjustment was at approximately 3\4 open and it was on a pistol length system firing 55gr M193.
<br>From PA: Very sorry to hear this! One of our reps will contact you.