An LR-308/AR-10 bolt carrier group (BCG) is a critical component of a firearm, responsible for various essential functions in the firing cycle. Here are the key details and specifications about this AR-10/LR-308 BCG:

Functionality: The BCG houses important components like the firing pin, gas key, cam pin, extractor, and bolt. Together, these components work in harmony to perform several functions, including feeding rounds from a detachable magazine, chambering a round, engaging the cam groove, locking into the barrel’s lugs, firing, and extracting spent cartridges. During extraction, the BCG absorbs the force generated by the explosion of the round by expanding gas in the carrier.

Gas Operation: Gas tapped from the barrel is directed into the gas key, creating an inertial force that propels the Bolt Carrier Group back into the buffer tube. This action helps to minimize recoil, allowing for smoother firing, and the cycle repeats for subsequent shots.

Caliber Compatibility: This BCG is designed for AR-10/LR-308 rifles and is compatible with various cartridges, including .308 Winchester, 7.62 NATO, 6.5 Creedmoor, and .243 Winchester. It’s a versatile option for rifles chambered in these calibers.

Materials: The standard AR-10/LR-308 bolt carrier is machined from 9310 Alloy Steel, known for its strength and durability. The BCG is also finished with a Nitride coating, which enhances resistance to heat and corrosion. Nitriding is a manufacturing process that diffuses nitrogen into the steel to create a case-hardened surface.

Additional Features: This BCG is full-auto compatible, making it suitable for rifles capable of full-auto or burst fire. It also includes forward assist notches, a feature that aids in manually chambering a round or addressing certain issues.

MPI Testing: Magnetic Particle Inspection (MPI) testing has been conducted to ensure the structural integrity and quality of the BCG. This testing helps identify any flaws or imperfections that could affect performance.

Platform: LR-308/AR-10

Caliber Compatibility: .308 Win, 7.62 NATO, 6.5 Creedmoor, .243 Win

Bolt Head Material: 9310 Alloy Steel

Bolt Head Finish: Nitride

Body Material: 8620 Alloy Steel

Body Finish: Nitride

Style: Standard

Gas System: Direct Impingement

Forward Assist Cuts: Yes

Full Auto Compatible: Yes

This LR-308/AR-10 BCG is a reliable and robust component designed for use in rifles chambered in various calibers, providing consistent performance and durability.