Best military grade gas block - Geissele Super Gas Stainless Steel Block w/SS Dowel Pin

You cannot go wrong with Geissele products, cause they are very designed, durable and made of quality material. In addition, stainless steel gas blocks have prolonged life compared to others due to corrosion resistant properties of stainless steel. Finally, the Geissele gas block can be pinned to avoid rotation which is critical to a proper function of a weapon. On a barrel it seats tightly as it supposed to and fit nicely under any handguard. I would definitely consider buying it again.