The SIONICS 11.5″ 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: 11.5” Medium Weight Chrome Lined, 41V50, NATO Chamber, 1:7, Chrome Lined, Air-Gauged, Radiograph and MP Inspected
• Gas System: Carbine-Length, Direct-Impingement
• Muzzle Device: A2 Flash Suppressor
• Bolt Carrier: No BCG included with the option to add an 8620 M16 Carrier – Phosphate coated or upgrade to NP3 Coated either option includes properly staked OCKS (Optimized Carrier Key Screws)
• Bolt: No BCG included with the option to add Carpenter No.158, HP/MPI Tested, Black Insert and Sprinco 5-Coil Heavy Extractor Spring – Phosphate coated w/ option to upgrade to NP3 Coated
• Charging Handle: GI Charging Handle included w/ option to upgrade to Raptor Ambidextrous
• Hand Guard: 10.8″ SIONICS – M-LOK with 5-Slot Rail Piece
• Sights: No Sights included w/ option to upgrade to Magpul MBUS Pro Front and Rear