TacFire AR-15 5.56 / .300 BLK M16 Profile BCG Black Nitride - BCG

TacFire AR 15 5 56 NATO 300 Blackout Complete Bolt Carrier Group Black Nitride BCG UPC 811261027008

Product Description

The TacFire® Complete AR-15 Bolt Carrier Group (SKU: BCG / UPC: 811261027008) is a duty-grade, drop-in core assembly designed to deliver dependable cycling and rock-solid headspace reliability in 5.56 NATO, .223 Remington, and .300 AAC Blackout platforms. Built to stringent military specifications, this complete BCG serves as an exceptional upgrade for budget factory rifles or the mechanical foundation for your next custom tactical or home-defense carbine build.

Engineered for maximum tensile strength and component longevity, the bolt carrier is CNC-machined from case-hardened AISI 8620 alloy steel featuring a full-auto M16 shroud for optimized carrier weight and smoother recoil impulse. The bolt is machined from high-tensile Carpenter 9310 alloy steel, shot-peened for surface stress relief, and Magnetic Particle Inspected (MPI) to ensure structural integrity under sustained firing schedules. Every component is treated with an advanced QPQ salt bath Black Nitride finish, creating a case-hardened, slick surface that dramatically reduces carbon buildup, resists chemical bore solvents, and minimizes the need for excessive wet lubrication.

Every subcomponent is tuned for absolute cycling integrity in the field. The gas key is machined from premium steel, secured to the carrier with Grade 8 hex fasteners, and aggressively staked to military specifications to prevent gas leakage under aggressive firing schedules. An enhanced 4140 extractor assembly equipped with a high-tension spring and Viton O-ring ensures clean, positive brass ejection through thousands of rounds, while the hard-chrome-plated firing pin ensures fast lock time and continuous resistance to primer pierce erosion.

*Armorer Bench Notes & Real-World Staging Guidance:*

Fitment Matrix: Direct drop-in fit for all standard mil-spec AR-15, M4, and M16 direct-impingement upper receivers chambered in 5.56x45mm NATO, .223 Remington, .300 AAC Blackout, .350 Legend, and .204 Ruger. CRITICAL: This BCG is designed for small-frame direct-impingement AR-15 platforms only. It is NOT compatible with large-frame AR-10/LR-308 rifles, dedicated blowback 9mm PCC uppers, or proprietary piston systems. While built to standard headspace tolerances, always verify headspace using certified SAAMI GO / NO-GO gauges when installing a new bolt assembly into a barrel extension. Ensure the four carrier bearing rails and cam pin receive a light coat of quality synthetic weapon lubricant before firing.

1. Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty.
2. Unpack the TacFire bolt carrier group and wipe away factory shipping preservative from all external rails and the bolt face.
3. Depress the bolt into the carrier and extend it forward into the unlocked position to verify smooth cam pin rotation and free firing pin travel.
4. Apply a thin coat of synthetic weapon lubricant to the four carrier guide rails, the cam pin track, and the gas ring bearing surface.
5. Slide the charging handle into the upper receiver channel, seat the complete BCG assembly, push both forward until the bolt locks into the barrel extension, and close the upper receiver.

Key Features

• Carpenter 9310 Alloy Bolt: Precision-turned from ultra-strong 9310 steel, shot-peened for high fatigue resistance, and Magnetic Particle Inspected (MPI) to eliminate micro-fractures.
• 8620 Full-Auto Carrier: Machined from case-hardened 8620 steel with an M16 profile that enhances lock time, balances carrier velocity, and softens felt recoil.
• Advanced QPQ Black Nitride Finish: Salt bath nitrocarburized surface treatment case-hardens steel to over 60 HRC, drastically reducing friction and carbon adherence for effortless cleaning.
• Properly Staked Mil-Spec Gas Key: Fastened with Grade 8 hardware torqued to specification and dual-staked to prevent gas leaks and carrier key loosening under sustained fire.
• Enhanced Extraction Assembly: Hardened 4140 steel extractor paired with heavy-duty spring, insert, and Viton O-ring ensures positive case rim purchase and clean ejection.
• Multi-Caliber Versatility: Direct drop-in compatibility across popular AR-15 chamberings including 5.56 NATO, .223 Rem, .300 AAC Blackout, and .350 Legend.

Product Specifications

• Brand: TacFire®
• Model/Series: AR-15 / M16 Complete Bolt Carrier Group
• MPN / SKU: BCG / BCG-N
• UPC: 811261027008
• Platform Compatibility: AR-15 / M4 / M16 Direct Impingement Upper Receivers
• Caliber Chambering: 5.56x45mm NATO, .223 Remington, .300 AAC Blackout, .350 Legend, .204 Ruger
• Carrier Material: AISI 8620 Alloy Steel
• Bolt Material: Carpenter 9310 Alloy Steel (MPI & Shot-Peened)
• Gas Key Fasteners: Grade 8 Screws, Staked per Mil-Spec
• Carrier Profile: Full-Auto M16 Profile
• Surface Finish: QPQ Salt Bath Black Nitride
• Country of Origin: United States of America