Seekins Precision Billet upper receivers combine strength and perfection into a rock solid platform to build your dream AR. All SP uppers are held to the same quality expectations. SP’s standard uppers are compatible with most aftermarket rail systems and is based off of the traditional design allowing multiple options on which to build from.
Big Book Catalog, Issue:67, Page:004
SPECS: Seekins Precision Billet Upper. CNC Machined from 7075-T6 Billet. M4 Feed Ramps. Mil-Spec 1913 Picatinny Rail. Type III Class 2 Hardcoat Anodized Finish.