AlphaOps AR-15 M4 Barrel Nut - Mil-Spec Product Description The AlphaOps 5.56 / .223 barrel nut is a perfect fit for ... Model : AO_Barrel_Nut Manufacturer : AlphaOps $9.95

AR-15 M4 M16 Firing Pin - Full Auto Rated Product Description Mil-spec, original-style, chrome plated M4 Ar-15 firing p... Model : ar15misc_firingpin Manufacturer : AlphaOps $14.95

Extractor Buffer AR-15 / M4 Product DescriptionThe Extractor Buffer is a rubber insert replaces factory bu... Model : Extractor-Buffer Manufacturer : AlphaOps $3.95

Extractor O Ring - Ar-15 / M4 Product DescriptionThe extractor o ring for the AR-15 / M4 prevents malfunctio... Model : Crane-O-Ring Manufacturer : AlphaOps $3.49

Extractor Spring Chrome Silicon AR-15 / M4 Product DescriptionManufactured to precise tolerances, these high quality, rep... Model : Extractor-Spring-CS Manufacturer : AlphaOps $5.95