Name: XTS AR-15 5.56 NATO Complete Bolt Carrier Group Black Nitride - BCG-BKN
Brand: Xtreme Tactical Sports
SKU: BCG-BKN
Price: 111.99 USD
Availability: InStock

XTS AR-15 5.56 NATO Complete Bolt Carrier Group Black Nitride - BCG-BKN

MSRP: $129.99

$111.99

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Product Description

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XTS Bolt Carrier Group 5.56 NATO Fits AR 15 Nitride Finish Black BCG BKN UPC 767820091556

Product Description

The XTS Complete Black Nitride Bolt Carrier Group for AR-15 / M16 platforms (MPN: BCG-BKN) is an essential, heavy-duty engine assembly purpose-built to deliver flawless cycling, thermal durability, and smooth operating friction across 5.56 NATO, .223 Remington, and .300 AAC Blackout carbines. Precision-machined in the USA from aircraft-quality 8620 steel, the full-auto M16 profile carrier provides optimal reciprocating mass for reliable brass ejection and smooth bolt velocity control under sustained rapid fire.

Every critical surface component of the BCG-BKN is treated with a advanced Black Nitride (QPQ) finish, delivering extreme surface hardness, slick lubricity, and superior corrosion resistance compared to standard phosphate coatings. The bolt is shot-peened and Magnetic Particle Inspected (MPI) to identify microscopic surface fractures before deployment. Equipped with a 4130 chromoly steel gas key secured by Grade 8 hardened fasteners that are properly staked to Mil-Spec standards, this bolt carrier group ensures gas seal integrity and eliminates the risk of hardware loosening over extended firing schedules.

Including a black extractor insert and crane O-ring for heavy-duty extraction force, the XTS BCG-BKN drops into all standard Mil-Spec AR-15 upper receivers. Backed by XTS quality assurance and strict manufacturing standards, it represents an outstanding value for custom bench builds, barrel upgrades, and emergency armorer replacement spares.

Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard AR-15 / M16 upper receivers chambered in 5.56x45mm NATO, .223 Remington, .223 Wylde, and .300 AAC Blackout. (Note: Not compatible with AR-10 / LR-308 large-frame receivers, 9mm PCC blowback uppers, or specific calibers requiring modified bolt face dimensions like 6.5 Grendel, 7.62x39, or .350 Legend).

Perform a complete firearm safety check: drop the magazine, pull the charging handle rearward, lock the action open, and visually inspect the chamber to verify zero live rounds are present.

Apply a light coat of premium firearm lubricant or CLP to the carrier rails, cam pin, bolt rings, and gas key interior.

Pull the bolt forward into its fully unlocked position within the carrier body.

Align the complete BCG-BKN assembly with the upper receiver bore track while sliding it forward into place under the charging handle.

Seat the charging handle and BCG fully forward until the bolt lugs rotate into full battery lockup against the barrel extension.

Perform a function check: cycle the charging handle, verify positive bolt catch engagement on an empty magazine, and test smooth drop-free forward battery closure.

Key Features

Precision 8620 Steel M16 Carrier: Full-auto profile aircraft-grade steel carrier provides proper timing and weight for smooth recoil management.
Advanced QPQ Black Nitride Finish: Ultra-smooth, corrosion-resistant surface treatment reduces friction and simplifies carbon cleaning.
Shot-Peened & MPI Inspected Bolt: Magnetic Particle Inspection ensures structural integrity and defect-free performance under high chamber pressure.
Mil-Spec Staked 4130 Gas Key: Secured with Grade 8 hardened hex fasteners properly staked per military specification to prevent gas leaks.
Enhanced Extractor Assembly: Fitted with a heavy-duty extractor spring, black rubber insert, and crane O-ring for continuous extraction under hot loads.
100% Drop-In Mil-Spec Compatibility: Engineered to standard AR-15 upper tolerances for seamless integration across factory and custom uppers.