This RevoltMfg gas lines upper is a sweet addition to a suppressed AR15. This upper has 10 slots machined at 30 degree angles forward to direct gas away. Hot gasses naturally rise, so it seemed best to let it go where it wants! We are currently using CMMG upper recivers, and they come with the dust cover and forward assist. They do NOT come with the charging handle. We used the charging handle to show that it acts as a block when installed, so nothing can sneak in the machined ports. We currently have all employees who shoot suppressed using these uppers, and they love them.

** NOTE: If you just want Revolt to machine the slots in an existing upper you own, go to the Gunsmith services at link below. 

Gunsmithing Services Archives – Gunsmith Live