Product Description
The Mk1 AR-15 Assembled Upper Receiver is a forged 7075‑T6 aluminum, mil‑spec machined upper (M16/M4) with M4 feedramps, delivered pre‑assembled with the port door and forward assist.
The Mk1 upper with anti-rotation interface is compatible with Griffin anti-rotation rails. These uppers also work with mil-spec rails without the anti-rotation tab.
Terra Brown Anodized Color Note: There are some inherent differences in final color due to the anodizing process. Shade and color may differ and may show blemishes due to nature of the lighter pigment used. Multiple variances can cause the final outcome of anodize process(materials, acid etch, dye, water temperature, etc). For a better match, selecting black anodized is encouraged.
