SIONICS 12.5″ Barrel

from: $20995

The SIONICS 12.5” Chrome Lined Barrel is a high-quality, versatile barrel that is perfect for a pistol or SBR.

These barrels will accommodate a Front Sight Base. Additionally, we offer the service and parts to drill, pin, and install an FSB if you so choose! The cost of this service is $125.00 for labor and $29.95 for an “F” marked FSB. If this is something you are interested in, please email us at and we will get you taken care of. 

SKU: S-B-125-CL Categories: , Product ID: 14838


The SIONICS 12.5” Chrome Lined Barrel is a high-quality barrel that is made from 41V50 Chrome Moly Vanadium Steel. It has a medium contour, a mid-length gas system, and a .750″ gas seat diameter. The barrel features hand-polished feed ramps and has a 1/7 twist rate. It is also threaded 1/2×28 and is manganese phosphate coated. The barrel is magnetic particle inspected and radiograph inspected. It is pre-dimpled for easy installation of the gas block. This barrel is a great choice for a general purpose pistol or SBR.


  • 12.5” Chambered in 5.56 NATO
  • 41V50 CMV Steel
  • Manganese Phosphate Coated
  • Chrome Lined
  • Medium Profile
  • .750″ gas seat diameter
  • 1/7 Twist Rate
  • Mid-Length Gas System
  • Magnetic Particle Inspected
  • Weight: 1 Lb. 6 oz.
  • Radiograph Inspected
  • Threaded 1/x28
  • Hand Polished Feed Ramps
  • Pre-Dimpled for easy Gas Block Installation
Barrel Specifications
Barrel Length 12.5 Inches
Chambering 5.56 NATO
Barrel Contour Medium
Twist Rate 1/7 Twist Rate
Thread Pitch 1/2 x 28
Gas System Mid Length
Gas Seat Diameter .750
Barrel Material 41V50 Chrome-Moly Vanadium Steel
Outer Coating Manganese Phosphate Coated
Inner Coating Chrome Lined
Weight 25.6 oz / 726 g

Key Features of the SIONICS Upper Receivers and Barrels

SIONICS Warranty

The SIONICS Warranty

All SIONICS Weapon Systems Firearms, Receivers and Parts are manufactured for a Lifetime of Hard Use. The definition of a Warranty is a Guarantee from a manufacturer that a defective product will be repaired or replaced.

SIONICS Parts Warranty (Barrels, BCGs, LPKs etc.)

All SIONICS Weapon Systems Parts carry our Guarantee against defects in original materials and workmanship. If any SIONICS product shows evidence of such defects, we will fix, repair, or replace your product with that of an equal value product. SIONICS Weapon Systems does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer’s products. 


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.


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