Lead & Steel ARC C158 Grit Cutter Bolt Carrier Group – TiN, 5.56mm/.300BLK, Individual HP/MPI BCG

• Designed for reliability, our sand cuts feature intentional debris channels that prevent material from interfering with the carrier and upper receiver even in the presence of dirt, sand, mud, or carbon build-up.

• Elongated carrier rails increase carrier stability inside the upper receiver for a more consistent bolt reciprocation.

• Carrier belly relief cuts provide smoother loaded magazine insertion on a closed bolt by providing extra wiggle room for the next-up cartridge.

• The ARC BCG features a two-step Titanium Nitride (TiN) PVD coating for superior durability. To ensure comprehensive coverage with PVD's line-of-sight limitations, we first gas nitride the carrier to diffuse a wear-proof base layer into the interior surfaces. The carrier's exterior surfaces are then bead blasted for the Titanium Nitride PVD. Our proprietary dual-layer process ensure every corner of the carrier is protected.

• The ARC bolt is individually proof tested and mag particle inspected with an inner diameter bolt carrier run that is machined tighter than competitor offerings.

• The ARC BCG features a Titanium Nitride (TiN) PVD coating for superior durability. To ensure comprehensive coverage, we first gas nitride the carrier, providing a wear-proof and rust-proof base even in internal crevices. After blasting the exterior, we apply the TiN PVD coating, for a dual-layer process to ensure every part of the carrier is protected.

• Our extractors are billet machined 4140 and manganese phosphate coated to retain grip against the casing rim, and utilize genuine Sprinco 5 coil extractor springs with rubber insert for added reliability and service life.

• Our machined chrome lined gas key sealed against the carrier with Permatex gasket sealant and is affixed with our OCKS fasteners at 53 in/lbs.

The All-Rounder Carbine Sand Cutter Bolt Carrier Group (ARC BCG) is our individually proof tested and mag particle inspected bolt with an inner diameter bolt run that is machined tighter than competitor offerings. We gas nitride the bolt carrier before applying a DLC finish to give you a much more durable product. This gives the bolt a “Just Right” gas seal inside of the carrier which increases gas efficiency and service life. Nearly all M16 BCG manufacturers do not compensate for the lack of chrome plating in a TDP bolt carrier, but we make up the difference with our tight tolerance machining. Our Sand Cutter BCGs come with machined debris channels for enhanced reliability in all conditions.

Our bolt is shot-peened Crucible Carpenter 158®, and individually proof tested to guarantee service life. Our machined, chrome lined gas key is sealed against the carrier with Permatex gasket sealant and is affixed with our OCKS fasteners at 53 in/lbs w/thread locker. Our extractors are billet machined 4140 and manganese phosphate coated to retain grip against the casing rim, and utilize genuine Sprinco 5 coil extractor springs with rubber insert for added reliability and service life.

Specs:

• Features carrier-belly scalloped relief cuts to assist with loaded magazine insertion.
• Extended rails for added carrier stability during cycling.
• Machined sand cuts limit granular resistance between upper receiver contact surfaces.
• 8620 M16 Carrier, tighter ID for TiN case depth
• Shot-peened C158 bolt, individually proof tested
• Machined debris channels for enhanced reliability in adverse conditions
• Gold Titanium Nitride coated
• Machined extractor installed with insert and Sprinco 5 coil spring
• Serrated OCKS fasteners
• Laser engraved with LS insignia so you can cyberbully an impoverished Redditor