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The Midwest Industries Alpha Series M4 Beam Side Folder solves a simple problem: you want a folding stock, but you also want to run the collapsible M4-style stock you already know and trust. This adapter clamps onto a 1913 Picatinny rail interface and gives you a side-folding hinge that accepts any Mil-Spec diameter stock, so you get to pick the cheek weld and length-of-pull that works for you instead of settling for whatever comes bolted on.
Built around a heavy-duty hinge machined from 4140 steel, this thing is not shy about being tough. The full-length locking lug and steel clamp with large surface engagement give you a solid, positive lock in both the extended and folded positions, so there's no rattle or flop when you shoulder the rifle. The skeletonized beam keeps things lean, and Midwest added a curved top to help cut down on any wobble from that cutaway design. Steel parts wear a mag phosphate finish that shrugs off moisture and holds up to hard handling.
It's popular on piston-driven AR-15 systems and AK-pattern rifles that run a Picatinny stock mount, which makes it a versatile pick if you're bouncing between platforms. The hinge can be set up for right or left folding depending on your ejection pattern and how you like to carry, and two QD sling attachment points let you clip in your favorite sling without hunting for real estate.
Extended, the assembly adds about 7 inches to your overall length, and folded it only tacks on roughly 0.75 inches, so your rifle drops down to a genuinely compact footprint for the safe, a bag, or a truck. The complete assembly runs right around 11.6 ounces. Made in the USA and backed by the Midwest Industries lifetime warranty, it's a straightforward, dependable way to add folding capability while keeping the stock you like.
No, this is a folding adapter, not a complete stock. It accepts any Mil-Spec diameter M4-style stock, so you add the collapsible stock of your choice. That's the whole point of the design, letting you run the cheek weld and length-of-pull you already like.
It clamps to a 1913 Picatinny rail stock interface, which is common on piston-driven AR-15 systems and many AK-pattern rifles. As long as your firearm has that Picatinny stock mount, the adapter bolts right up. You'll want to confirm your host has the correct rail interface before ordering.
Yes, the hinge can be configured for either right or left side folding. That flexibility lets you set it up around your ejection pattern and how you prefer to carry or store the rifle. It's a nice touch that makes the adapter work across a wider range of builds.
Folded, the assembly only adds about 0.75 inches to your firearm, and extended it adds roughly 7 inches. That makes for a genuinely compact package for storage and transport. The complete assembly weighs around 11.6 ounces.
| UPC | 812102034278 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MIALPHAM4BSF |
| Color | Black |
| Length | 10 |
| Model | |
| Product Type | Stock |
| Shipping Weight | 0.87 |
| Style | Folding |
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