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*Includes FATHOM 3D patch for a limited time*

Carrier Material: Case Hardened 8620 Steel

Finish: Black Nitride. This advanced low friction coating minimizes the need for lubricants.

Radiused Gas Key: 4130 Steel, attached with Grade 8 hardware, torqued to correct specifications, and then properly staked into a milled “valley” using a press stake to properly deform the metal. This procedure ensure proper positioning and gas key locking.

Ejection Port: Area is milled with added material for more strength and rigidity

Cam Pin: Hardened 4340 cam pin

Firing Pin: Mil Spec firing pin made of 8740 steel, center-less ground and Hard Chrome coated

Carrier fits AR15/M4 compatible style Rifles (i.e.) .223/5.56mm, .300BLK, 6.8SPC

Laser Engraved Fathom Arms “FATHOM” logo

Bolt Assembly: The Bolt Assembly is machined from solid round stock to TRUE Mil-Spec dimensions. The entire external surface, including the bolt bearing surfaces, is CNC ground after heat treatment to ensure proper and unaltered tolerances.

Material: Case Hardened 9310 Steel, Shot Peened

Finish: Black Nitride coated

Extractor: 4340 Steel, Magnesium Phosphate coated, Mil-Spec Extractor Spring, O-Ring, and Black Extractor Spring Rubber Insert, Shot Peened

MPI: Magnetic Particle Inspected

HPT: High Pressure Test

Bolts are lot tested under MIL-STD-1816 for both HPT and MPI

Proudly made in the USA

Additional Info

Additional Info

Manufacturer Fathom Arms
Finish No
Barrel Length No
Caliber No
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No



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