Picatinny to M-LOK Adapters: Which One Do You Need?

Which Picatinny to M-LOK adapter you need depends on which direction you are going. To mount an Atlas bipod on an M-LOK handguard, you want the BT70 Atlas M-LOK adapter. To add a Picatinny rail section to an M-LOK handguard for other accessories, you want an M-LOK rail like the BT73. And to add a flush-cup or sling point to M-LOK, the BT80 M-LOK Flush Cup Rail does that. All three are American-made and backed by a lifetime warranty.

The confusion is understandable: M-LOK and Picatinny solve the mounting problem in opposite ways, so bridging them means picking the adapter that matches your goal, not just your handguard. This guide sorts the three common goals, tells you exactly which B&T adapter fits each, and shows how to install it. If you are unsure which standard your rifle uses, start by reading what a Picatinny rail is, then come back here to pick the adapter.

Why do you need an adapter at all?

M-LOK and Picatinny are not compatible out of the box. M-LOK is a set of open slots cut into a handguard; Picatinny is a raised rail you clamp onto. An accessory built for one will not attach to the other, so an adapter is the part that translates between them.

The key question is direction: are you trying to put a rail-mount accessory (like an Atlas bipod) onto an M-LOK handguard, or add an M-LOK or rail surface to a rifle that lacks it? The answer points you to a specific adapter.

Which adapter do you need for your goal?

Most adapter questions come down to one of three goals. Find yours below, then jump to the matching B&T part.

If none of these match exactly, the clamps and adapters category lists the full set, or send us a photo of your handguard and what you want to mount.

Goal 1: Mount an Atlas bipod on an M-LOK handguard (BT70)

This is the most common case. Your handguard has M-LOK slots and you want to run an Atlas bipod that clamps to Picatinny. The BT70 Atlas M-LOK adapter bolts into the M-LOK slots and gives the Atlas its mounting interface, keeping the setup low and direct without a full-length rail.

Goal 2: Add a Picatinny rail section to M-LOK (BT73)

If you want to mount Picatinny accessories generally (not just a bipod) on an M-LOK handguard, an M-LOK rail section like the BT73 bolts into the slots and gives you a short stretch of Picatinny rail to clamp onto. This is the flexible option when you have more than one rail accessory to mount.

Goal 3: Add a flush cup or sling point to M-LOK (BT80)

If your goal is a sling or flush-cup attachment rather than a bipod, the BT80 M-LOK Flush Cup Rail adds that mounting point to an M-LOK handguard. It solves the sling and swivel-stud side of the M-LOK ecosystem rather than the optic or bipod side.

What if my handguard is Picatinny and I want M-LOK?

The reverse case is less common but real. If you have a Picatinny rail and the accessory you want is M-LOK, you generally do not convert the rail itself; instead you choose the M-LOK part’s Picatinny-compatible version, or mount an M-LOK rail section that clamps to Picatinny. For bipods specifically, this is rarely needed because Atlas bipods already clamp to Picatinny directly.

Simplest path for bipods: if your handguard is Picatinny, just use a standard Atlas clamp or the ADM-170-S quick-detach clamp. You only need a Picatinny-to-M-LOK adapter when the handguard is M-LOK and the bipod clamp is Picatinny.

How do you install an M-LOK adapter?

M-LOK hardware uses a simple captured-nut design that locks into the slot when you tighten it. The install is quick, but torque matters: too loose and it shifts under recoil, too tight and you can damage the handguard.

• Drop the adapter’s M-LOK nuts into your chosen slots and rotate them a quarter turn so they sit crosswise behind the slot.

• Position the adapter where you want it and start the screws by hand so the nuts pull up against the back of the rail.

• Snug the screws evenly, then torque to the manufacturer’s spec (an M-LOK hardware spec is published; do not guess).

• Mount your Atlas bipod or accessory to the adapter and confirm there is no play before you shoot.

Torque and thread-locker

Follow the published M-LOK torque values and use a thread-locker if the maker recommends it. The how-to-mount-a-bipod guide includes a fastener torque reference so your bipod stays put without overtightening into the handguard.

Pick the adapter that matches your goal

Mounting a bipod on M-LOK? Get the BT70. Adding a rail section? The BT73. Adding a sling point? The BT80. Match the part to what you want to mount, not just to your handguard.

Browse the clamps and adapters, or send us a photo of your handguard and the accessory you want to run and we will point you to the right part.

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