SIONICS Phosphate Bolt Carrier Group

(3 customer reviews)


If you are looking for a high-quality, durable, and economical bolt carrier group for your AR15, the SIONICS Phosphate Coated 5.56 Bolt Carrier Group is a great option. It is sure to provide years of trouble-free service.

35 in stock

Due to Market Conditions, the Estimated Ship Date is June 25, 2024 - June 28, 2024
SKU: S-BCG-P Categories: , Product ID: 6241


The SIONICS Phosphate Bolt Carrier Group is a high-quality, Mil-Spec BCG that is machined to USGI specifications. It has a Parkerized exterior and a chrome-lined interior. The carrier includes a proper Mil-Spec gas key that is chrome-lined and heat treated. The gas key is secured to the carrier via OCKS (Optimized Carrier Key Screws) and properly staked. Each carrier includes an installed gasket formed by aviation Permatex that is applied by hand to the mating surfaces between the gas key and the carrier.

The bolt assembly is machined from Mil-Spec Carpenter No. 158® Steel and is shot peened for increased strength. It includes a tool steel machined extractor and ejector, an HD Sprinco extractor spring (5-Coil) , and is high pressure tested and magnetic particle inspected.

Here are some of the key features of the SIONICS M16 style carrier:

  • Machined to USGI specifications
  • OCKS screws
  • Staked gas key
  • Aviation Permatex gasket
  • Carpenter 158® steel bolt
  • HP/MPI tested bolt
  • Shot peened bolt
  • Sprinco Heavy Duty Extractor Spring – 5-Coil
  • Black Spring Insert

Prior to shipping, all SIONICS Bolt Carrier Groups are test fired for function. Because of the test firing procedure, the bolt carrier group may show handling marks consistent with these quality control procedures.

Bolt Carrier Groups
Key Screws OCKS (Optimized Carrier Key Screw)
Extractor Spring Sprinco 5-Coil Heavy Duty Extractor Spring
Bolt Material Carpenter 158® Steel
Gas Key Type Mil-Spec Gas Key
Weight 25.6 oz / 726 g
Inner Coating Chrome Lined
Outer Coating Manganese Phosphate Coated

Key Features of the SIONICS Upper Receivers and Bolt Carrier Groups

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. 

Warranty Processing Instructions

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.


3 reviews for SIONICS Phosphate Bolt Carrier Group

  1. Chris (verified owner)

    Best phosphate bcg on the market! Sionics does everything the right way. They are a quality company one of the best in the business. I can’t wait to get my hands on a Np3 version when they come back in stock. Thanks Sionics!

  2. Joshua

    Excellent quality. Individual HP and MPI tested not batch tested. Shot peened. Everything from Sionics is top quality with zero corners cut.

  3. Prestun (verified owner)

    The best bolt carrier, period.

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