The BCM 3 inch Picatinny Rail Section is an aluminium MIL-STD-1913 rail ladder for AR-15 and M4 rifles, bolting directly to any M-LOK handguard.
The adapter that lets an M-LOK handguard take Picatinny accessories — three inches of proper 1913 rail, where you want it and nowhere else.
M-LOK handguards are lighter and slimmer than quad rails precisely because they carry no rail they are not using. The cost of that is any accessory built for a Picatinny interface — a vertical grip, a light mount, a bipod adapter, an offset optic — has nothing to clamp to. This section solves it in one part: it fastens through the M-LOK slots and presents three inches of hard-anodised aircraft aluminium alloy machined to Mil-Standard 1913 Picatinny Arsenal specification.
The profile is deliberately snag-resistant, so it does not become the thing that catches on a sling or a bag every time the rifle moves. Mounting hardware and a hex key are supplied, so nothing else is needed to fit it.
Why shooters choose the BCM 3 inch Picatinny Rail Section
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True MIL-STD-1913 geometry — Picatinny accessories clamp and index as intended
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Hard-anodised aluminium — hard-wearing without the weight of steel
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Direct M-LOK attachment — no intermediate adapter plate
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Snag-resistant profile — shaped so it does not foul kit
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Hardware and hex key included — fit it the day it arrives
What the BCM 3 inch Picatinny Rail Section fits
Fits any M-LOK handguard or forend with the slot spacing to take a 3 inch section, on AR-15/M4 rifles including UK straight-pull AR-15 builds. It is an M-LOK part, so it will not attach to a KeyMod handguard or to an existing Picatinny rail. Once fitted it accepts any accessory built for a 1913 Picatinny interface. Position it before you tighten down — a section too far forward puts a light or grip where the support hand is not — then torque the fasteners with the supplied hex key and re-check them after the first session.
Specifications
| Platform |
AR-15 / M4 |
| Fits |
M-LOK handguards and forends |
| Type |
Picatinny rail section, MIL-STD-1913 |
| Material |
Aircraft aluminium alloy |
| Finish |
Hard anodised |
| Length |
3 in (76 mm) |
| Mount interface |
M-LOK, mounting hardware and hex key included |
| Brand |
Bravo Company USA |
| MPN |
BCM-MCMR-1913-A3 |
Add rail only where the rifle needs it. Order the BCM 3 inch Picatinny Rail Section today — in stock at Xtreme Tactical Gun Parts with £5 tracked UK delivery in 7–10 business days.
Explore more: M-LOK Accessories, AR-15 Parts & Accessories or browse all Bravo Company USA.
