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These gas blocks along with Aero Precision's gas tubes create an efficient and reliable gas system for your AR15 or AR 308 rifle build. Features: Fits barrels with .625 Outer Diameter Constructed from 4140 hardened steel Phosphate coating Low profile for easy fitment Set Screws are Steel 10-32 x 3/16 Knurled Cup Point Made in the USA *Roll pin not included*
ATTENTION: If you are ordering the last of an available quantity and you do not check with an associate of Crossroads Firearms before placing your order. You may be at risk of getting a full refund/ cancellation if our in house inventory or distributors are out of stock before your online order has been processed.