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Mk 2 Receiver Extension - Mk2 Receiver Extension
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$49.95
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SKU: 430105165
Overview
Built for AR15, M16, and M4 setups, this receiver extension is intended for shooters assembling or maintaining a Mil-Spec-compatible stock system. It is machined from 7075T6 and finished with a hard coat anodize, and it is designed to work with stocks made to Mil-Spec size, including USGI, BCMGUNFIGHTER, Colt, LMT, SOPMOD, VLTOR, and Stag Arms. The same extension can also be used on most AR-10s, but it requires an M16 rifle action spring and a specific BCM MK2 buffer. That makes it a practical choice for a purpose-built build, while also meaning it is not a drop-in option for standard carbine or rifle buffers.
Why Hunters Choose the Bravo Company
Machined From
7075T6 and built to Mil-Spec
Hard Coat
Anodized per Mil-A-8625F, Type III,
Compatible Ar15,
AR15, M16, M4 platforms and
Use Mil-spec
Stocks including USGI, BCMGUNFIGHTER, Colt,
Clear Compatibility
Guidance helps match the correct
Key Features
- BCM MK2 receiver extension for AR15, M16, and M4 platforms.
- Machined from 7075T6 and built to Mil-Spec dimensions and specifications.
- Hard coat anodized to Mil-A-8625F, Type III, Class 2.
- Compatible with mil-spec stocks including USGI, BCMGUNFIGHTER, Colt, LMT, SOPMOD, VLTOR, and Stag Arms.
- Can also be used on most AR-10s.
- Requires a M16 rifle action spring and specific BCM MK2 buffer; carbine and rifle buffers will not work.
Best Used For
- AR-15, M16, or M4 owners needing a mil-spec receiver extension for compatible stock setups
- Users building with mil-spec stocks such as USGI, BCMGUNFIGHTER, Colt, LMT, SOPMOD, or VLTOR
- Most AR-10 owners seeking a receiver extension that fits many platforms
- Builders who already plan to use the required M16 rifle action spring and BCM MK2 buffer
Specifications
| Ar 10 Compatibility | Most AR-10s |
|---|---|
| Blade Finish | Hard Coat Anodized per Mil-A-8625F, Type III, Class 2 |
| Carbine Buffer Compatibility | No |
| Compatible Buffer | Specific BCM MK2 buffer |
| Compatible Platforms | AR15, M16, M4 |
| Compatible Stocks | USGI, BCMGUNFIGHTER(TM), Colt, LMT, SOPMOD, VLTOR, Stag Arms, and others that are made to the Mil-Spec size |
| Manufacturing Standard | Mil-Spec dimensions and specifications |
| Material | 7075T6 |
| Required Spring | M16 rifle action spring |
| Rifle Buffer Compatibility | No |
Pros
- Machined from 7075T6 and built to Mil-Spec dimensions and specifications.
- Hard Coat Anodized per Mil-A-8625F, Type III, Class 2.
- Compatible with AR15, M16, M4 platforms and most AR-10s.
- Designed for use with Mil-Spec stocks including USGI, BCMGUNFIGHTER, Colt, and LMT.
- Clear compatibility guidance helps match the correct stock and buffer components.
Considerations & Trade-offs
- Requires a specific BCM MK2 buffer and an M16 rifle action spring; standard carbine and rifle buffers will not work.
- Built to Mil-Spec dimensions, so it is intended for stocks made to Mil-Spec size rather than commercial-spec stocks.
- Compatibility is described for AR15/M16/M4 and most AR-10s, so fit should still be verified against the exact rifle setup before purchase.
- Product data does not include the needed buffer or spring, so those components may need to be sourced separately.
Suggested Comparisons
- AR-15 mil-spec receiver extensions
- AR-10 receiver extensions
- Mil-spec compatible stocks
- Buffer tube and spring components
Suggested Accessories
- AR-15 stock
- M16 rifle action spring
- BCM MK2 buffer
- Mil-spec receiver extension-compatible stock
Frequently Asked Questions
What platforms is the BCM MK2 Receiver Extension intended for?
It is listed for AR15, M16, and M4 rifles, and the description also says it can be used on most AR-10s.
Is this receiver extension mil-spec size?
Yes. The product is described as machined to Mil-Spec dimensions and specifications, with the smaller stock interface dimension associated with mil-spec receiver extensions.
What stocks are compatible with this receiver extension?
The description says it should be used with stocks made to the mil-spec size, including USGI, BCMGUNFIGHTER, Colt, LMT, SOPMOD, VLTOR, Stag Arms, and others of that size.
What spring and buffer does this receiver extension require?
The product notes that it requires a M16 rifle action spring and a specific BCM MK2 buffer. It also states that carbine and rifle buffers will not work.
What finish is on the BCM MK2 Receiver Extension?
It is hard coat anodized per Mil-A-8625F, Type III, Class 2.