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The Alpha Series M4 Beam is Midwest Industries' answer for anyone running a firearm with a 1913 rail stock mount who wants to bolt on a real mil-spec buttstock. Instead of being stuck with proprietary hardware, this fixed adapter bridges that Picatinny interface to standard M4-style stocks, so you can pick whatever collapsible stock or brace fits your setup. It's a common upgrade on piston AR builds, BRN 180 platforms, AK variants with rail adapters, and pistol-caliber carbines that ship with a bare rail out back.
The beam itself is machined from 4140 steel and finished in black, so it carries the kind of heft that tells you it isn't going anywhere. The skeletonized profile trims weight where it can, and the curved top surface is there specifically to cut down on the wobble that open beam designs can get once a stock is mounted. Two QD sling sockets are built right in, giving you left or right side attachment without adding an aftermarket mount.
Installation is straightforward and clamps to the 1913 rail, and this fixed version skips the folding hinge for a simpler, rock-solid lock-up. Once your mil-spec stock is on, it adds about seven inches to the overall length of the firearm. Fully dehorned and deburred edges mean there are no sharp spots digging into your hand or cheek during a shooting session.
Because it accepts any mil-spec diameter stock, this is a build-your-own situation. Some shooters find certain stocks and braces fit tighter than others, and keeping the stock snug against your shoulder cleans up any minor play. Backed by Midwest Industries' lifetime warranty and made in the USA, it's a dependable way to turn a compact beam into a genuinely adaptable rear end for your rifle.
It accepts any standard mil-spec diameter buttstock, so you can run your favorite collapsible stock or brace. The adapter itself does not include a stock, so you'll pick and add your own. Certain models fit tighter than others, and keeping the stock pressed against your shoulder helps take up any minor play.
This is the fixed, non-folding Picatinny attachment model, part number MI-ALPHA-M4BS. It skips the side-folding hinge for a simpler, solid lock-up. If you want the beam to fold to the side for storage, that's a separate Alpha Series M4 Beam Side Folder.
It clamps to a 1913 Picatinny rail stock interface, which is common on piston AR-15 builds, BRN 180 platforms, AK variants with a rail adapter, and various pistol-caliber carbines. As long as your firearm has that rail at the rear, this adapter bridges it to a mil-spec stock. Installation is straightforward and doesn't call for any special gunsmithing.
Once you mount a mil-spec stock, the beam adds roughly seven inches to the overall length of the firearm. That keeps the whole setup compact compared to a traditional buffer tube arrangement. The skeletonized 4140 steel build also helps keep weight in check out back.
| UPC | 812102034285 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MI-ALPHA-M4BS |
| Color | Black |
| Length | 10 |
| Model | |
| Product Type | Stock |
| Shipping Weight | 0.87 |
| Style | Fixed |
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