Bravo Company BCM Mil-Spec Carbine Stock Hardware Mounting Kit

Bravo Company BCM Mil-Spec Carbine Stock Hardware Mounting Kit

Complete your AR-15 lower receiver build with the Bravo Company BCM Mil-Spec Carbine Stock Hardware Mounting Kit. This all-in-one buffer tube assembly includes the essential components needed to install a Mil-Spec collapsible stock, making it a practical choice for new builds, lower receiver upgrades, and replacement stock hardware.

Complete Mil-Spec Buffer Tube Assembly

BCM packages the receiver extension, end plate, castle nut, carbine action spring, and carbine buffer together so you can install a compatible Mil-Spec stock without sourcing each core component separately. The six-position receiver extension provides adjustable length-of-pull settings for a more adaptable AR-15 setup.

Designed for Mil-Spec Collapsible Stocks

This kit is built around a Mil-Spec diameter carbine receiver extension and works with many compatible collapsible stock models from leading AR-15 manufacturers. It is an ideal foundation for configuring a rifle with a durable, adjustable stock system.

Key Features

• Complete carbine stock mounting hardware kit
• Mil-Spec, six-position carbine receiver extension
• Includes carbine buffer and M4 carbine action spring
• Includes receiver end plate and castle lock nut
• Designed for AR-15-pattern lower receivers
• Compatible with Mil-Spec diameter collapsible stocks
• Black matte finish

What's Included

• Mil-Spec six-position carbine receiver extension / buffer tube
• Carbine buffer assembly
• M4 carbine action spring
• Receiver end plate
• Castle lock nut

Specifications

• Brand: Bravo Company
• Manufacturer Part Number: BCM-STOCK-HARDWARE-KIT
• UPC: 855877004404
• Platform Fit: AR rifles / AR-15-pattern lower receivers
• Type: Complete buffer tube assembly
• Receiver Extension: Mil-Spec, 6-position carbine
• Buffer System: Carbine buffer and M4 carbine action spring
• Color: Black
• Finish: Matte
• Subcategory: Stocks & Buffer Tubes

Compatibility

• Compatible with Mil-Spec diameter collapsible stocks.
• Compatible with many stock models from BCM, VLTOR, LMT, Magpul CTR-M, Stag Arms, Colt, and similar manufacturers when configured for Mil-Spec receiver extensions.
• Designed for AR-15-pattern carbine lower receiver assemblies.

Not Compatible

• Not intended for commercial-spec diameter collapsible stocks unless the stock manufacturer specifically confirms compatibility.
• Not intended as a direct fit for fixed rifle stocks or rifle-length buffer systems.
• Stock body is not included; this kit contains the mounting hardware and buffer system components only.

Important Notes

• Verify that your selected stock is designed for a Mil-Spec diameter carbine receiver extension before purchase.
• Professional installation is recommended. Proper castle nut tightening and staking, where appropriate, help support a secure installation.
• Confirm buffer-system compatibility with your complete firearm configuration before installation.

A Reliable Foundation for Your AR-15 Stock Assembly

Whether you are finishing a stripped lower or replacing worn stock hardware, the BCM Mil-Spec Carbine Stock Hardware Mounting Kit gives your AR-15 build the key components needed for a clean, dependable adjustable-stock installation.

Frequently Asked Questions

Does this kit include the actual stock?

No. This kit includes the buffer tube assembly, carbine buffer, action spring, end plate, and castle nut. A stock body must be purchased separately.

Will this kit fit a Magpul CTR stock?

It is compatible with Mil-Spec diameter collapsible stocks, including compatible Magpul CTR-M configurations. Verify your specific stock is made for a Mil-Spec receiver extension.

Is the buffer tube Mil-Spec or commercial-spec?

This kit includes a Mil-Spec, six-position carbine receiver extension.

What parts are included in the BCM stock hardware kit?

The kit includes a Mil-Spec carbine receiver extension, carbine buffer, M4 carbine action spring, receiver end plate, and castle lock nut.

Will this work on an AR-15 lower receiver?

Yes. It is designed for AR-15-pattern lower receiver assemblies that use a carbine buffer system.

Can I use this with a fixed rifle stock?

No. This is a carbine-length adjustable-stock hardware kit and is not intended for fixed rifle stock or rifle-length buffer systems.

Do I need any additional parts to install this kit?

You will need a compatible Mil-Spec collapsible stock body and appropriate installation tools. Confirm your complete lower receiver parts configuration before assembly.