Toolcraft 5.56 Nato / 223 Rem Bolt Carrier Group - Chrome Phosphate Toolcraft 5.56 Nato / 223 Rem Bolt Carrier Group W/ C158 Bolt - Chrome Phosphate Toolcraft 7.62X39 Bolt Carrier Group - Chrome Phosphate

Toolcraft 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt - Chrome Phosphate

SKU: TC556BCGMP158
Original price was: $179.99.Current price is: $115.49.
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In stock

0.00159 0.00159
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115.49000 115.49000
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Toolcraft 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt – Chrome Phosphate

The Toolcraft 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt – Chrome Phosphate is a mil‑spec, full‑auto M16 BCG designed for AR‑15 rifles chambered in 5.56 NATO and .223 Remington. It features a Carrier machined from U.S.‑sourced 8620 steel and a C158 Carpenter steel bolt, both shot‑peened and magnetic particle inspected (MPI) for maximum structural integrity. The combination of a chrome‑lined carrier and gas key with a durable magnesium phosphate finish preserves original MIL‑SPEC appearance and performance.

This assembly includes a 4130 steel gas key secured with Grade 8 fasteners and properly staked to maintain gas alignment and reduce leaks. Internals include a 4140 steel extractor and three mil‑spec gas rings, while the firing pin is crafted from 416 stainless steel. A robust cam pin made of 8620 steel complements the assembly. These mil‑spec materials and precise machining ensure reliable cycling under high-round‑count and severe-use conditions.

The chrome lining on the carrier and gas key improves corrosion resistance and extends service life under carbon‑rich operating conditions. The matte magnesium phosphate coating enhances surface protection, minimizes friction, and reduces carbon adhesion—making maintenance simpler while preserving the classic AR‑15 aesthetic.

Toolcraft is a trusted OEM supplier to the U.S. military and commercial firearm manufacturers. When sourced through authorized dealers such as Arm or Ally, this Toolcraft BCG is backed by a full no‑questions‑asked lifetime warranty. Coatings applied by third‑party services will void that warranty, so authenticity and authorized sourcing are essential.

Whether you’re building a duty-ready patrol rifle, a suppressed training upper, or a precision AR‑15, the Toolcraft 5.56 NATO / 223 Rem Bolt Carrier Group w/ C158 Bolt – Chrome Phosphate delivers foundational reliability. With mil‑spec materials, American-made craftsmanship, authentic finish, and lifetime protection, it’s a cornerstone upgrade for serious shooters.

Product Information

Manufacturer

Toolcraft
Platform

AR15
Caliber

223 Rem, 300 Blackout, 350 Legend, 5.56 NATO
Carrier Material

8620 Steel
Bolt Material

C158 Steel
Finish

Phosphate, Chrome Lined
Color

Black
Compatibility

Standard AR15 components
Features

MPI Inspected, Shot Peened, FA Serrations
Made in USA

Yes
Weight

11.52oz
Olight
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