Sionics Weapon Systems (SWS) AR-15 Premium Complete 5.56 Upper Receiver - 16" (Phosphate BCG)

The SIONICS 16 Upper Receiver Group Premium Edition is Precision Machined from 7075-T6 Aluminum to maximize Strength and reduce Weight. The Premium Series features the Tightest Machining Tolerances and most lustrous Midnight Type III Class II Hard Coat Anodize. Tighter Tolerances allow for a tighter Barrel Fit which improves Accuracy and finish. All of our Premium Receivers are THERMAL FIT to the barrel, this furthers the accuracy of the upper receiver group greatly. These uppers come with the SIONICS logo hard engraved above the charging handle and on the opposite side of the ejection port. Features: Machined from 6061-T6 aluminum Hardcoat anodized M-LOK and QD sling slots Specifications: Configuration: AR15 Style Upper Receiver Group, 5.56mm NATO Upper Receiver: 7075-T6 Aluminum - Premium - M4 Barrel: 16" Medium Contour, 41V50, NATO Chamber, 1:8, Chrome Lined, Air-Gauged, Radiograph and MP Inspected Gas System: Mid-Length Muzzle Device: A2 Flash Suppressor Bolt Carrier: upgrade to N