Gas block yankee hill - Yankee Hill Machine Low Profile Gas Block With Set Screw Mounting YHM-9383

good solid built product, buy american, this would have got a 5 star if they would throw in a roller pin for the gas tube, just in case you bummed the existing pin up removing it. knowing you dont have a back up pin will sure make you take care removing the orig. did drop mine in the carpet, but found, like i say, roller pin cost less than a dime, throw one in.