Rifle Bolt Carrier

Name: Rifle Bolt Carrier | Machined Firearm Components - Frigate
Price: 249.00 USD
Availability: InStock

Rifle Bolt Carrier maintains structural stability during rapid-fire sequences by using homogenized, vacuum-melted steel alloys with controlled carbon content and grain refinement. Thermal expansion coefficients are matched across interfacing components to prevent tolerance shift under heat. This ensures consistent lockup geometry and timing even after extended firing sessions exceeding 800 rounds without cooldown.

Material Specification

8620 Alloy Steel (per SAE AMS 6260) or Stainless Steel

Dimensional Accuracy

±0.005 mm (critical bore/rail surfaces), ±0.03 mm (non-critical)

Surface Finish

Ra ≤ 0.4 μm (sliding surfaces), Ra ≤ 1.2 μm (structural)

Hardness Requirement

58-62 HRC (case hardened surfaces), 28-32 HRC (core)

Heat Treatment

Carburizing to 0.5-0.8 mm case depth (per AMS 2759/7)

Product Description

Rifle Bolt Carrier integrates mass-balanced profiles and optimized gas key geometry to regulate bolt velocity and dwell timing. Combined with consistent internal carrier bore dimensions, the system mitigates premature unlocking and bolt bounce. This contributes to uniform chamber pressure decay, essential for extraction reliability across suppressed and unsuppressed configurations.

Tolerance Levels

IT5 for critical fits (per ISO 286), ±0.01° angular tolerances

Certification Standard

MIL-S-5000, NATO AQAP 2110, ITAR compliant

Non-Destructive Testing (NDT)

100% MPI (ASTM E1444), 10% random UT (ASTM E213)

Wear Resistance

Minimum 50,000 cycles (per MIL-STD-810 sand/dust test)

Corrosion Resistance

Salt spray resistance ≥ 500 hrs (ASTM B117), Nitride coated

Technical Advantages

Rifle Bolt Carrier is treated using ferritic nitrocarburizing or DLC coating processes, achieving surface hardness values exceeding 65 HRC while preserving core ductility. Microfinish Ra values below 0.2 µm reduce kinetic friction against upper receiver rails and bolt cam paths. The low-friction surface enables dry-cycle tolerance, reducing lubrication dependency in fouled conditions.

Rifle Bolt Carrier is machined with positional and dimensional tolerances within ±12.5 µm at critical contact interfaces. Alignment of bolt lugs and carrier rails is maintained to prevent asymmetrical stress loading. This dimensional accuracy ensures consistent headspace control across multiple upper receivers, minimizing failure risks associated with uneven bolt wear or sheared lugs.

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Industry Applications

Wind Turbines

Yaw Drive Pinion Gear adjusts nacelle orientation by meshing with yaw bearing teeth for optimale wind alignment and load distribution.

Radar Antenna Systems

Used to rotate large radar platforms by engaging with slew drives, ensuring precise azimuthal movement under variable inertial loads.

Offshore Cranes

Controls upper structure rotation by transmitting torque to the slewing ring, enabling safe, stable operation under dynamic marine conditions.

Rotating Solar Platforms

Implements sun-tracking motion via azimuth rotation, improving energy yield by maintaining optimale panel orientation throughout the daylight cycle.

Tunnel Boring Machines (TBMs)

Facilitates controlled cutterhead rotation using integrated drive trains, handling high torque under constrained underground operating environments.

Heavy-Duty Excavators

Yaw Drive Pinion Gear enables 360° superstructure rotation through slewing engagement, maintaining consistent torque under high-load excavation cycles.

Reciprocating Mass Optimization

Rifle Bolt Carrier incorporates calculated reciprocating mass ratios to control recoil impulse and return-to-battery speed. Carrier mass distribution reduces axial torque and carrier tilt, minimizing buffer tube wear in extended-length receivers. These dynamics improve cycling symmetry and reduce stress concentration at the cam pin slot.

Rifle Bolt Carrier is cryogenically treated post-machining to relieve internal stress and stabilize dimensional geometry. This process aligns crystalline microstructure and prevents distortion during thermal cycling. The result is predictable behavior across extreme temperature shifts, critical for field deployment in arctic and desert operational theaters.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure dimensional stability of its Rifle Bolt Carrier under high firing temperatures?

Frigate uses vacuum arc remelted steel with low residual stress for thermal consistency. Each Rifle Bolt Carrier is cryogenically stress-relieved after final machining. This stabilizes microstructure and prevents thermal warping during cyclic firing. Final bore dimensions remain within ±10 microns after 1000+ rounds at elevated temperatures.

What inspection methods does Frigate use to detect internal flaws in its Rifle Bolt Carrier?

Frigate applies ultrasonic testing and magnetic particle inspection to all critical zones of the Rifle Bolt Carrier. Focus areas include the cam slot, rear lug interface, and gas key junction. These tests detect cracks, inclusions, or delamination not visible to the eye. Only flaw-free components proceed to final coating and assembly.

How does Frigate optimize gas flow dynamics in its Rifle Bolt Carrier for both suppressed and unsuppressed systems?

Fregatte designs gas key bores with tuned internal diameter and axis alignment within 0.05°. This ensures consistent bolt velocity across variable gas pressures. The Rifle Bolt Carrier is compatible with adjustable gas blocks for system tuning. Gas impulse is regulated to avoid carrier overrun or short-stroking.

What surface treatments does Frigate use to reduce wear in the Rifle Bolt Carrier’s cam path?

Frigate applies FNC (Ferritic Nitrocarburizing) or DLC (Diamond-Like Carbon) coatings on the cam slot area. These coatings exceed 900 HV microhardness and resist scoring under dry or fouled conditions. The Rifle Bolt Carrier shows minimal surface degradation after 25,000 cycles in endurance testing. This improves long-term reliability with reduced lubrication.

How does Frigate maintain rail straightness in its Rifle Bolt Carrier for consistent upper receiver engagement?

Each Rifle Bolt Carrier rail is precision-ground with total runout below 0.01 mm over the full length. Frigate uses coordinate measuring machines (CMM) for rail geometry verification. Proper straightness ensures linear reciprocation and eliminates carrier yaw. This minimizes wear on aluminum receiver channels during full-auto or high-rate fire.

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