SIONICS 12.5″ Upper Receiver Group

(1 customer review)

from: $59995

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

The SIONICS 12.5″ 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 21, 2024 - June 26, 2024
SKU: S-UR-N-ACH-NS-125 Category: Product ID: 12739


If you choose either the Extreme Reduced Gas Port Barrel, your Complete Upper Receiver will not come with the SIONICS A2 Style Flash Hider. If desired, you can send your own muzzle device to be installed on your Upper Receiver. If you would like to use your own Muzzle Device, please email and you will receive instructions for mailing. 

Base Configuration:

Upper Receiver: 7075 M4 AR15 Style 5.56mm NATO
Barrel: SIONICS 12.5” Chrome-Lined 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 – If the 12.5″ Extreme Reduced Gas Port Barrel is selected, there will not be an A2 Style Flash Hider installed.
Hand Guard: SIONICS 11.8″ M-LOK Handguard

Optional Installed Add-Ons:

Barrel Gas Port Size: SIONICS 12.5″ Extreme Reduced Gas Port 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
Option to send in your muzzle device to be installed onto the Extreme Reduced Gas Port Barrel.

Key Features of the SIONICS Upper Receiver

SIONICS Warranty

All SIONICS Weapon Systems Firearms, Receivers and Parts are manufactured for a Lifetime of Hard Use. With that said, we do expect you to use your SIONICS products, and if needed, trust that we would have you covered if your product fails.


SIONICS Weapon Systems Complete Rifles, Complete Upper Receivers and Complete Lower Receivers are Guaranteed to Run for Life, Period. If you shoot out the barrel, we’ll replace it. If you need replacement parts, we’ll send them to you. If you break your Rifle, we’ll fix it. If your Rifle is taken into evidence after Justifiable Use of Deadly Force, we’ll replace it for you. Let’s break that down for you.

  • Who is Covered – Anyone with an unaltered Complete SIONICS Firearm, Upper Receiver or Lower Receiver
  • What is Covered –  Anything and Everything related to the function of Complete Firearms, Upper Receivers and Lower Receivers
  • What is Not Covered 
    • Modifying the internals of the Complete Firearm, Upper Receiver or Lower Receiver.
    • Using Non-Factory Ammunition (aka Reloads)
    • Careless Handling, Abuse or Misuse
    • Rust or Corrosion
    • Barrel Obstruction
    • Altering or Modifying existing Parts
    • Damages caused by failure to perform normal maintenance
    • Damages due to high velocity, high pressure, reloaded, remanufactured, or other non-standard ammunition
    • Cosmetic damages
    • Dimensional alterations caused from Cerakote or Paint (for example the removal of too much material or the addition of too much material altering the tolerance of components)
  • How Long is it Covered – Lifetime of the unaltered Complete Firearm, Upper or Lower Receiver
  • How will it be Covered – All Deemed Defective Parts will be either Repaired or Replaced by SIONICS staff


Step 1:

Call 520.396.3460 (Monday – Thursday 7:00 – 17:00 MST) and speak with one of our Excellent SIONICS staff to begin the troubleshooting process of your product. If deemed necessary you will then obtain an RMA# (Return Merchandise Authorization) to initiate the warranty claim. Outside of business hours please email us at

Step 2:

Once established that your item should return to SIONICS for further inspection, you will need to ship your defective/non-working item.

Return the item to our facility:
Make sure your assigned RMA# is clearly displayed on the outside of all return packages. This is necessary to match each package to the correct warranty claim. In addition please include a document listing your RMA#, Name, Phone Number as well as email address.

ATTN: Warranty Department
SIONICS Weapon Systems
5118 E. Pima Steet
Tucson, Arizona 85712

Step 3:

Our team here at SIONICS will work quickly to process your claim. Once your item is received, we will inspect and test within one business day. If the item is deemed defective, we will communicate back to you on your claim with the appropriate plan for repair or replacement.

1 review for SIONICS 12.5″ Upper Receiver Group

  1. Ralph Bartolome (verified owner)

    This upper is extremely underrated and slept on! My “go-to” was my 11.5” Geissele Super Duty and now it’s this (12.5” SIONICS)! Pair this with an A5 buffer system and this thing runs so smooth! Amazing guys to work with and we’re also very helpful. A great company with great products and customer service to match.

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