SIONICS 11.5″ Upper Receiver Group

(2 customer reviews)

from: $61995

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

The SIONICS 11.5″ 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 May 15, 2024 - May 20, 2024
SKU: N/A Category: Product ID: 6884


If you choose either the Silencer Dedicated or 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
BarrelSIONICS 11.5” Medium Contour – 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: Carbine-Length – Direct-Impingement
Muzzle Device: SIONICS A2 Style Flash Hider – If the 11.5″ Silencer Dedicated or Extreme Reduced Gas Port Barrel is selected, there will not be an A2 Style Flash Hider installed.
Hand Guard: SIONICS 10.8″ M-LOK Handguard

Optional Installed Add-Ons:

Barrel Gas Port Size: SIONICS 11.5″ Silencer Dedicated Barrel or SIONICS 11.5″ 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 Silencer Dedicated or Extreme Reduced Gas Port Barrel’s

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.

2 reviews for SIONICS 11.5″ Upper Receiver Group

  1. Cade Prutzman

    Hands down the best bang for buck receiver out there. Every part of it is quality made and assembled, zero malfunctions over 1.2k rounds in. Perfectly gassed and feels like smooth glass to manipulate. I’ll be buying Sionics for all my future builds.

  2. Redacted

    Best upper receiver I’ve ever used. Ive had it for about 2 years and 10,000 rounds and I’ve yet to have a malfunction still. Great warranty for when my barrel gets shot out or anything happens. Sionics over BCM any day.

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