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When your M-LOK handguard leaves you short on Picatinny real estate, this little BCM rail section fills the gap without adding bulk. It bolts straight to any M-LOK slot and gives you a true MIL-STD 1913 platform for the accessories that still run on Picatinny. Three inches is a sweet spot length, long enough to plant a bipod, sling mount, or light body, short enough that it disappears into a lean build.
This is the aluminum version, and that matters. It is machined from hard-anodized aircraft aluminum alloy, so it can take load-bearing accessories like bipod mounts, sling swivels, and vertical grips that would be too much for a polymer piece. BCM cuts the edges with a snag-resistant profile so the rail stays low and clean and doesn't grab on slings, gloves, or gear when you're moving. Aluminum sections like this can be torqued down to 30 in/lbs, which gives you a genuinely tight, repeatable lockup.
Because it's built to the Mil-Standard 1913 Picatinny Arsenal spec, it plays nice with just about any accessory that clamps to a standard rail. Folks who run these tend to use them to span a gas block on a slim handguard, add a bipod mounting point up front, or drop a light exactly where they want it rather than where the M-LOK slots happen to land. Installation is straightforward with the included hardware, and once it's snugged down it stays put.
BCM has a strong reputation for building parts that hold up, and this rail section is a good example of that. It's a simple piece done right, lightweight, strong, and finished in a clean black anodize that blends in with the rest of your rifle. If you've been fighting with where to mount that next accessory, this solves it.
Yes. This is the aluminum version, machined from hard-anodized aircraft aluminum alloy, which makes it the right choice for load-bearing gear like bipod mounts, sling mounts, and vertical grips. The polymer version is better suited to lighter, non-load-bearing accessories. Aluminum sections like this can be torqued to 30 in/lbs for a solid, tight lockup.
It mounts to any M-LOK compatible handguard, which covers most modern free-float rails on the market. It attaches through the M-LOK slots using the included hardware. Just confirm you have three inches of clear slot space where you want to mount it before ordering.
It does. The rail ships with the hex screws needed to attach it to your M-LOK slots, and BCM typically includes a hex key as well. You won't need to source any extra parts to get it installed.
Yes, it's manufactured to the Mil-Standard 1913 Picatinny Arsenal specifications. That means any accessory designed for a standard 1913 rail will clamp on and lock up correctly. The snag-resistant profile keeps the edges clean without giving up any of the Mil-Standard dimensions.
| UPC | 812526021588 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MCMR1913A3 |
| Color | Black |
| Length | 3 |
| Model | |
| Product Type | 1-Piece Base |
| Style | M-LOK |
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