The gas block in your AR 15 is essential to the function of your rifle. Primary Arms has the best gas blocks, with all the features you’re looking for. Find affordable gas blocks, adjustable gas blocks, low profile gas blocks, gas blocks with picatinny rails and more. You can even install a gas pistol kit from Adams Arms. Manufacturers we carry include Aero Precision, Bear Creek Arsenal, Bravo Company, CMMG, Daniel Defense, Faxon Firearms, JP Enterprises, Midwest Industries, Odin Works, Radical Firearms, Troy Industries, WMD Guns, and many more.