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Colt
The Colt Colt Bolt Repair Kit M4 is a genuine OEM parts set built to military specifications for keeping AR-15 and M4 rifles running when bolt carrier group components wear out or fail. This isn't a complete bolt carrier assembly—it's a targeted collection of the high-stress parts that typically need replacement first: the extractor, ejector, firing pin, springs, pins, and retaining hardware. If you run your rifle hard, compete regularly, or just want to be ready for field repairs, this kit lets you address the most common bolt group failures without buying a whole new BCG.
Every piece inside carries Colt's manufacturing mark and mil-spec tolerances, so fitment and function are guaranteed in any standard AR platform. The black finish matches modern mil-spec components and resists corrosion under normal storage and use. This kit belongs in every serious rifleman's maintenance arsenal—whether you're an armorer maintaining a range battery, a hunter who services his own rifle, or a tactical shooter who keeps spares on hand for matches or training events.
Think of it as preventive maintenance in a box. The extractor, ejector, and their springs are the parts that do the heavy lifting cycle after cycle; having a complete refresh set available means downtime stays short and reliability stays high. Colt's reputation for mil-spec consistency means you can trust these components to work the first time, every time.
| Platform | AR-15 / M4 |
| Finish | Black |
| Compatibility | Mil-spec AR-15/M4 bolt carrier groups |
| Components Included | Extractor, bolt rings, ejector, safety detent spring, extractor spring assembly, extractor pin, ejector spring, pin, firing pin, retaining pin |
Yes, if your rifle runs a mil-spec bolt carrier group. This Colt kit is manufactured to military specifications and is compatible with any standard AR-15 or M4 platform using mil-spec components.
The kit contains the extractor, ejector, firing pin, bolt rings, extractor spring assembly, extractor pin, ejector spring, safety detent spring, retaining pin, and pin—essentially all the wear-prone internal components of a bolt carrier group.
Basic armorer knowledge and standard AR maintenance tools are recommended. If you're new to BCG work, consult Colt documentation or a qualified gunsmith for your first installation.
This is a parts kit only—it contains replacement components for the high-wear internals of a bolt carrier group. You'll need an existing bolt carrier to install these components into, or purchase a complete BCG separately.
Colt
The Colt Colt Bolt Repair Kit M4 is a genuine OEM parts set built to military specifications for keeping AR-15 and M4 rifles running when bolt carrier group components wear out or fail. This isn't a complete bolt carrier assembly—it's a targeted collection of the high-stress parts that typically need replacement first: the extractor, ejector, firing pin, springs, pins, and retaining hardware. If you run your rifle hard, compete regularly, or just want to be ready for field repairs, this kit lets you address the most common bolt group failures without buying a whole new BCG.
Every piece inside carries Colt's manufacturing mark and mil-spec tolerances, so fitment and function are guaranteed in any standard AR platform. The black finish matches modern mil-spec components and resists corrosion under normal storage and use. This kit belongs in every serious rifleman's maintenance arsenal—whether you're an armorer maintaining a range battery, a hunter who services his own rifle, or a tactical shooter who keeps spares on hand for matches or training events.
Think of it as preventive maintenance in a box. The extractor, ejector, and their springs are the parts that do the heavy lifting cycle after cycle; having a complete refresh set available means downtime stays short and reliability stays high. Colt's reputation for mil-spec consistency means you can trust these components to work the first time, every time.
| Platform | AR-15 / M4 |
| Finish | Black |
| Compatibility | Mil-spec AR-15/M4 bolt carrier groups |
| Components Included | Extractor, bolt rings, ejector, safety detent spring, extractor spring assembly, extractor pin, ejector spring, pin, firing pin, retaining pin |
Yes, if your rifle runs a mil-spec bolt carrier group. This Colt kit is manufactured to military specifications and is compatible with any standard AR-15 or M4 platform using mil-spec components.
The kit contains the extractor, ejector, firing pin, bolt rings, extractor spring assembly, extractor pin, ejector spring, safety detent spring, retaining pin, and pin—essentially all the wear-prone internal components of a bolt carrier group.
Basic armorer knowledge and standard AR maintenance tools are recommended. If you're new to BCG work, consult Colt documentation or a qualified gunsmith for your first installation.
This is a parts kit only—it contains replacement components for the high-wear internals of a bolt carrier group. You'll need an existing bolt carrier to install these components into, or purchase a complete BCG separately.
