F Superlative Arms Ar-15 Solid Adjustable Gas Block - Ar-15 Solid Adjustable Gas Block .936" Stainless Steel $89.99 SABO-DI-936SS show more like this $12.50 Brownells F Superlative Arms Adjustable Bleed-Off Gas Block Set Screw AR-15, LR-308 - 819562 $89.99 SABO-DI-936SS show more like this 5.00 MidwayUSA F Superlative Arms Adjustable Bleed Off AR-15/AR-10 Gas Block, .936in, Solid, Set Screw , Stainless Steel Matte, Steel Grey, SABO-DI-936SS $89.99 SABODI936SS show more like this Free Shipping on most orders over $49 Optics Planet