SIONICS 16″ Complete Premium Upper Receiver Group – 5.56

Original price was: $829.95.Current price is: $789.95.

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Product Description

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 SIONICS 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.

Sionics 16″ Upper Receiver Group Premium Edition includes a 16″ Chrome Lined Barrel – Medium Contour, 13.5″ SIONICS – M-LOK rail with 5-Slot Rail Piece, and a Radian Ambi Charging Handle.

  • 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, Direct-Impingement
  • Muzzle Device: A2 Flash Suppressor
  • Bolt Carrier: 8620 M16 Carrier – Phosphate
  • Bolt: Sprinco 5-Coil Heavy Extractor Spring – Phosphate coated
  • Charging Handle: Raptor Ambidextrous
  • Hand Guard: 13.5″ SIONICS
  • Sights: No Sights included w/ option to upgrade to Magpul MBUS Pro Front and Rear




Technical Information

Barrel Twist



5.56 NATO / .223 Remington

Color / Pattern

Firearm Compatibility




7075 Aluminum



Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit