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This one is a favorite for anyone running an AK, CZ Scorpion, MPX, JAKL, Kuna, Ruger Charger, or just about any host with a vertical Picatinny rail on the back of the receiver. The Midwest Industries Side Folder Buffer Tube Adaptor clamps onto that 1913 rail and gives you a threaded interface for a standard Mil-Spec buffer tube, which means you can finally hang the AR stock or brace you actually like on a gun that never shipped with one. The whole thing is machined from heavy-duty 4140 steel with a full-length locking lug and a manganese phosphate finish, so it feels like a solid chunk of hardware the second you pick it up.
The headline feature here is the fold. The steel clamp has a large engagement surface that locks up solid in both the open and folded positions, and folks who run it consistently mention there's no wiggle or flop once it's set. It can be configured to fold to either the left or right depending on how your controls and charging handle are laid out. Open, it adds about 2.5 inches to your overall length, and folded it only tacks on around 0.75 inches, so it tucks in tight for storage or a smaller pack. Complete assembly weight lands right around 8.4 ounces.
Because it takes a standard Mil-Spec buffer tube, your stock options stay wide open. Folks have run everything from Magpul stocks that fold flush against the receiver to wider BCM cheek-rest setups, and even storage-compartment tubes thread right in. Worth knowing up front: this mounts to a Picatinny/1913 interface, so your host needs that rail on the rear of the receiver. It is not a drop-in part for a standard AR-15 lower, which already has its own buffer tube threads.
Made in the USA, this is the kind of part that quietly does its job for years. If you've got a bufferless host begging for a real stock and a fold, this is one of the most trusted answers on the market.
No, this is not meant for a standard AR-15 lower since that platform already has its own buffer tube threads and no rear Picatinny rail. It's designed for hosts that have a vertical 1913 rail on the back of the receiver, like an AK, CZ Scorpion, MPX, or similar. If you want a folder for an AR-15, you'd want a different style of adapter.
It accepts any standard Mil-Spec buffer tube, which opens the door to just about any AR-pattern stock or brace you prefer. People run Magpul, BCM, and storage-compartment tubes on it without issue. Just thread on your buffer tube of choice and attach your stock as you normally would.
The steel clamp uses a large engagement surface and a full-length locking lug, so it locks up firmly in both the open and folded positions. Users consistently report tight tension with no flop, and it stays put when folded against the receiver. How flush it sits when folded depends on the profile of the stock you pair with it.
In the open position it adds roughly 2.5 inches to your firearm's overall length. Folded, it only adds about 0.75 inches, which keeps things compact for storage or transport. The complete assembly weighs around 8.4 ounces.
| UPC | 812102033325 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MI-STAP-SF-BT |
| Color | Black |
| Length | 6.7500 |
| Model | |
| Product Type | Adaptor |
| Shipping Weight | 0.665 |
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