SIONICS Phosphate Bolt Carrier Group

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alt="Sionics black phosphate bolt carrier group shown at angle"
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alt="Sionics black phosphate bolt carrier group shown closeup with sionics logo and gas key and bolt"
alt="Sionics black phosphate bolt carrier group with closeup of Optimized Carrier Key Screws holding the Gas Key in place"

SIONICS Phosphate Bolt Carrier Group

(3 customer reviews)

$15995

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.

7 in stock

Due to Market Conditions, the Estimated Ship Date is August 6, 2024 - August 9, 2024
SKU: S-BCG-P Categories: , Product ID: 6241

Description

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 warranty@sionicsweaponsystems.com

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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The AR-15 bolt carrier group (AKA the BCG) is the part of the rifle or pistol that is responsible for performing semi-automatic fire when the trigger is pulled. It does this by first allowing the firing pin to strike the primer on the chambered round. Then grabs and ejects the spent shell casing from the fired round. It then re-cocks the hammer in the lower receiver for the next round which ends up grabbing a new round from the magazine and chambering it.

Carpenter No. 158 steel is the mil-spec steel used for fabricating the bolt itself. This type of steel provides the best performance and lifespan for the BCG. C158 is case- (or surface-) hardened. This means the exterior of the steel is made to be very hard, preventing cracking and surface wear. Inside, the steel is softer and more flexible, preventing deformation and stress fractures.

These are two types of testing we do on all of our Bolt Carrier Groups.

HPT or High Pressure Testing, is another test performed by firing a high-pressure cartridge through the BCG being tested. HPT is done first to expose any potential flaws in the bolt. Then MPI testing is done to find any flaws or potential flaws.

MPI or Magnetic Particle Inspected, is a testing method used to test for microscopic cracks or fissures created during the manufacturing process. To test for this, the BCG is placed inside a magnetic field and a liquid solution containing magnetic particles is then applied to the steel. The magnetic particles will stick to any cracks, fissures, or tiny imperfections that are on or just under the surface. If any cracks, fissures or imperfections are found that BCG is scrapped.

 

Since the gas key wears out before any other components, the key is made as a separate component and bolts to the body of the carrier. To ensure the key doesn’t get loose after being subjected to gas and recoil, SIONICS BCGs are hand staked utilizing a Michiguns MOMOAKS staking jig. Staking the key in the MOMOAKS creates a much more consistent stake, which enhances the longevity of the bond created by the fasteners.

Of course.

Phosphate coatings are porous and absorb oil and lubrication well by design. These are current Mil-Spec by the U.S. Military. When used in conjunction with quality external oils, a phosphate coating will protect the external of the BCG from corrosion. But, you must lubricate phosphate finishes regularly to give that protection.

NP3 is an Electroless Nickel coating with embedded TEFLON. The TEFLON is bonded to the particles of Nickel at the molecular level providing self lubrication throughout the entire coating. The Nickel in this finish provides corrosion and abrasion resistance. NP3 BCGs require less lubrication and they typically withstand heat and friction better than a standard phosphate or nitride-coated BCG. Because NP3 is chrome-like, it wipes off and cleans easily, often requiring no solvents or harsh chemicals.

Shot peening is a process used to make metals more stress-resistant. It is commonly used in engine pistons. However, it is also used to make the SIONICS bolt carrier groups more durable and long-lasting.

We choose to use the OCKS (Optimized Carrier Key Screws) because of their unique design features. There are twelve splines on the heads, giving depressions and projections for carrier key metal to stake/flow into and engage like gear teeth. This makes sure we’ve got the best possible retention of carrier key screws.

Sprinco AR-15 Extractor Springs are made from high quality Chrome Silicon wire stock that has been heat treated, stress relieved, and cryogenically processed to produce long lasting durability. 5-Coil springs provide a higher spring pressure than OEM springs for use in all AR-15 pattern rifles and performs well even if the rifle is dirty.

Here at SIONICS, we test fire EVERY BCG, upper receiver group, and firearm.

Our test firing process is simple:

  • BCGs get 5 rounds of M193 and another single round in a separate magazine to ensure function, ejection pattern, and lock-back.
  • All upper receiver groups and firearms get 7 rounds of M193 and another single round in a separate magazine to ensure function, ejection pattern, and lock-back.

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