SIONICS NP3 Coated Bolt Carrier Group

(5 customer reviews)


The SIONICS NP3 Coated Bolt Carrier Group: Better Looks, Better Performance

The SIONICS NP3 Coated Bolt Carrier Group is not only aesthetically pleasing, but it also performs better than other types of coatings. NP3 is a thin, impregnable coating that bonds to the host material, making it much more durable than other coatings. It is also more corrosion-resistant and heat-resistant, making it ideal for use in harsh environments.

In addition to its superior performance, the SIONICS NP3 Coated Bolt Carrier Group is also backed by a lifetime warranty. This means that you can be confident that your investment is protected.

If you are looking for a bolt carrier group that looks good and performs even better, then the SIONICS NP3 Coated Bolt Carrier Group is the perfect choice for you.


3 in stock

Estimated Ship Date July 1, 2024 - July 4, 2024
SKU: S-BCG-NP3 Categories: , Product ID: 5989


The SIONICS NP3 Coated Bolt Carrier Group is a M16 style carrier machined to USGI (United States Government Issue) specifications. It includes a properly sized Mil-Spec gas key that is NP3 coated and heat treated. The gas key is secured to the carrier with OCKS (Optimized Carrier Key Screws) and properly staked to prevent it from backing out. Each carrier includes a hand-installed gasket formed by aviation Permatex to the mating surfaces between the gas key and the carrier. This helps to decrease the risk of under gassing.

SIONICS bolts are manufactured from Carpenter 158® steel. Each bolt is HP/MPI (High Pressure / Magnetic Particle) tested and inspected. These shot peened bolts come equipped with a Sprinco Heavy Duty Extractor Spring (5-Coil) and Black Spring Insert. In addition to the carrier, the bolt and cam pin have also been NP3 treated to enhance corrosion resistance and carbon buildup.

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

  • Machined to USGI specifications
  • NP3 coated gas key
  • 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
  • NP3 treated bolt and cam pin


Prior to shipping, all SIONICS Bolt Carrier Groups are Test Fired for function. Because of the Test Firing Procedure, the Bolt Carrier Group could show handling marks consistent with these Quality Control Procedures.

Tooling Marks on SIONICS NP3 Coated Bolt Carrier Groups

Due to the inherent nature of NP3 coating, tooling marks may be present on the SIONICS NP3 Coated Bolt Carrier Groups. Tooling marks are cosmetic and have zero effect on function.

NP3 coating is a thin, impregnable coating that bonds to the host material. This makes it much less forgiving of tooling marks than other coatings, such as phosphate and nitride, which are thicker and darker.

Despite the presence of tooling marks, all SIONICS NP3 coated bolt carrier groups are backed by our lifetime warranty. This warranty covers any manufacturer defect that would affect function.

If you have any questions or concerns about tooling marks on your SIONICS NP3 coated bolt carrier group, please do not hesitate to contact us. We are here to help you get the most out of your firearm.

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 11.6 oz / 329 g
Inner Coating NP3
Outer Coating NP3

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.


5 reviews for SIONICS NP3 Coated Bolt Carrier Group

  1. Adam28

    Excellent BCG.

  2. Sam (verified owner)

    These are very likely the best BCGs on the market. There are numerous others, including “enhanced” varieties, but many just end up solving non-existent problems on top of charging exorbitant prices .

  3. GAJD (verified owner)

    Suggested by many as the best BCG available, I believe it. Machining is perfect, coating is flawless. Amazing how much more precise the bolt fitment is compared to more budget minded BCG’s out there. Definitely test fired before shipping which is a good thing. I have many BCG’s by many different manufacturer’s, and this is the best looking and feeling by far.

  4. Skyler (verified owner)

    Amazed at the quality of this BCG.

  5. Chengxuan Wang (verified owner)

    This is definitely one of, if not the best, BCG on the market. The silver NP3 coating and machining on all critical and outside surfaces are silk smooth, although the sample I have does have some visible/detectable tooling marks on non-critical surfaces, as the description has suggested. Hoping to purchase more whenever I can.

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