Rainier Arms Low Profile Match Grade Gas Block was designed to fit the match grade barrels in the market place. Many of the LP gas blocks in the marketplace today are designed to fit service grade barrels. If you have ever tried to install a VLTOR or Stag style gas block on a Match Grade Stainless Steel barrel, you know that many times, the gas blocks are just too tight and will either seriously mar the barrel or sometimes, you have to hone the gas block to a larger inner diameter .755.

The new Rainier Arms LP Match Grade block was purposely made .005 larger to fit better on match grade barrels.