Does any company make a blank sleeve to use in place of the gas block.

[LtDan]

I have 3 Grendel Ar's 3 -223/556 Ar's and a Valkyrie all in side charger no gas. I'm behind enemy lines in Commiefornia. The only time I have trouble cycling is with very hot loads with the Grendel, the rest is just pull back and let it go. I now order barrels without gas ports, but I have made quite a few collars to plug the gas port.