SIONICS 14.8″ Upper Receiver Group

from: $59995

It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws.

The SIONICS 14.8″ Upper Receiver is a fully complete Upper Receiver Group, designed for the most accurate and durable configuration. They are fully assembled, headspaced, and test fired to ensure reliability and accuracy.


Estimated Completion Date June 28, 2023 - July 3, 2023
SKU: S-UR-N-ACH-NS-125-1 Category: Product ID: 17022


Base Configuration:

Upper Receiver: 7075 M4 AR15 Style 5.56mm NATO
Barrel: SIONICS 14.8” Medium Contour Barrel – 41V50, NATO Chamber, 1:7, 5R Rifling, Chrome Lined, Air-Gauged, Radiograph and MP Inspected
Barrel Gas Port Size: SIONICS Standard Size Gas Port
Gas System: Mid-Length – Direct-Impingement
Muzzle Device: SIONICS A2 Style Flash Hider
Hand Guard: SIONICS 13.5″ M-LOK Handguard

Optional Installed Add-Ons:

Barrel Gas Port Size: SIONICS 14.8″ Extreme Reduced Gas Port Barrel or SIONICS 14.8″ Silencer Dedicated Barrel
Bolt Carrier Group: SIONICS Phosphate Coated BCG or SIONICS NP3 Coated BCG
Charging Handle: Radian Raptor Ambidextrous Charging Handle
Iron Sights: Magpul MBUS or Magpul MBUS Pro

Key Features of the SIONICS Upper Receiver


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Here at SIONICS, we test fire EVERY BCG, upper receiver group, and firearm.

Our test firing process is simple:

  • BCGs get 5 rounds of M193 and another single round in a separate magazine to ensure function, ejection pattern, and lock-back.
  • All upper receiver groups and firearms get 7 rounds of M193 and another single round in a separate magazine to ensure function, ejection pattern, and lock-back.

SIONICS handguards are incredibly rigid and the inherent design features ensure anti-rotation. Through rigorous testing both by SIONICS and the many LE agencies using SIONICS rifles we can ensure zero retention when using IR/VIS aiming devices.

SIONICS handguards feature QD attachment points at the forward and rear 3 and 9 o’clock positions. SIONICS QD receiver sockets are anti-rotational.

The SIONICS barrels utilize 5R Rifling. 5R Rifling helps fight bullet failure due to a softer angle on the sides of the lands vs. conventional style rifling that utilizes 90° corners of the lands, which is a very hard edge.  Furthermore, with 5R, you have 5 lands in the bore of the barrel.  The odd number of lands does not directly oppose one another. The combination of these two things deforms the bullet less – less distortion to the bullet jacket when the bullet makes the jump from the case into the rifling.  This helps fight bullet failure and increases the inherent accuracy of the barrel.  Lastly, the gentler edges of lands on the 5R Rifling allow easier cleaning of the bore.  The 90° corners of conventional rifling make it harder to reach lead and other contaminants when cleaning.  The softer edges of the lands on 5R Rifling allow for a much more thorough cleaning process.

By sending all of our barrels to Radiograph, or X-Ray testing we are able to identify possible structural defects within the barrel.

This is an example of a barrel defect that would not be detected to the naked eye.