I am working on piecing together an upper right now. It is an 18" Sabre Defense barrel with a Aero Precision upper and a 13" VTAC Extreme rail. Now the problem is that I had picked up a Midwest industries Low Pro gas block. However the hole on the gas block is a hair to small to fit on the barrel or the barrel is a hair to large. I am going to dig out some calipers tomorrow and take some measurements. In the mean time what gas block should I be looking at to fit under the tube if it turns out the current one is the problem?
Would this Rainier Arms gas block fit my needs?
http://www.rainierarms.com/?page=shop/detail&product_id=1872