The Fightlite Industries MCR Bolt O-Ring (Part #15112, UPC 859714006491) is a genuine OEM small part designed to keep your Fightlite MCR (Mission Configurable Rifle) belt-fed upper running at peak reliability. This compact but critical elastomer O-ring supports proper bolt operation, gas sealing, and long-term durability – especially in high round-count, high-heat environments where belt-fed systems truly get worked hard.
OEM Bolt O-Ring for the Fightlite MCR Platform
This component isn’t a generic hardware store O-ring. It’s a factory-spec Fightlite part meant specifically for the MCR bolt assembly:
Direct replacement for the original MCR bolt O-ring
Maintains correct fit, compression, and sealing within the bolt system
Designed to match Fightlite’s engineering tolerances for reliable cycling
Using genuine OEM parts helps ensure your MCR continues to function as designed, instead of compromising reliability with “close enough” substitutes.
Critical for Reliable Cycling & Gas Management
In belt-fed and high-volume AR-based systems, small parts like the bolt O-ring can make a big difference:
Helps maintain proper gas sealing in the bolt assembly where required by design
Supports consistent bolt movement and lockup, crucial for reliable feeding and extraction
Reduces the risk of inconsistencies, short-stroking, or premature wear elsewhere in the operating system
If you’re noticing cycling issues or have a high-mileage MCR, inspecting and replacing worn O-rings is a key part of smart maintenance.
Built for High-Heat, High-Round-Count Use
The MCR is often used for sustained fire and demanding training:
The bolt O-ring is made from heat- and wear-resistant elastomer appropriate for repeated firing cycles
Engineered to tolerate the thermal and mechanical stress that occurs during long strings of fire
A fresh O-ring can help extend the life and consistency of your bolt assembly under hard use
For departments, training companies, or serious enthusiasts who push the MCR platform, keeping spare bolt O-rings on hand is a simple way to reduce downtime and prevent avoidable malfunctions.
Easy, Armorer-Level Replacement
Replacing the Fightlite MCR Bolt O-Ring 15112 is typically a straightforward armorer task:
Designed as a drop-in replacement part for compatible MCR bolts
No permanent modifications required – remove the old O-ring, inspect, and install the new one
Ideal for scheduled maintenance, troubleshooting, and rebuilds
As with any weapon maintenance, ensure the firearm is unloaded, cleared, and safe before disassembly, and verify proper function after reassembly.
Essential Addition to Your MCR Spare Parts Kit
Serious belt-fed owners know that small parts keep big systems running:
Compact and inexpensive, but mission-critical if your existing O-ring fails in the field
Perfect for range bags, unit armory spares, and home bench stock
Smart to pair with other MCR spares like feed tray components, ejectors, springs, and firing pins
If your MCR is part of a duty, training, or defensive setup, having at least one extra bolt O-ring on hand is simply good planning.
Key Specs – Fightlite Industries MCR Bolt O-Ring 15112
Manufacturer: Fightlite Industries
Product: MCR Bolt O-Ring
Part Number / MPN: 15112
UPC: 859714006491
Platform Compatibility: Fightlite MCR belt-fed upper receiver systems (MCR bolt assembly)
Category: OEM small part / replacement component
Function: Supports proper bolt operation and sealing to help maintain reliable cycling and long-term durability
If you rely on your Fightlite MCR and want to keep it running at peak performance, the Fightlite Industries MCR Bolt O-Ring (15112, 859714006491) is a must-have maintenance and spare parts item—small in size, but huge in importance for keeping your belt-fed system smooth, reliable, and ready to run.
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