Description
The Midwest Industries Arm Brace Side-Folding Stock in O.D. Green is what you reach for when a basic buffer tube feels flimsy but a full stock takes up too much room. The heart of it is a heavy-duty side-folding mechanism machined from 4140 heat-treated steel with a full-length locking lug, so it snaps into a positive lock in both the extended and folded positions. No wobble at the range, no rattle in the truck. It mounts to any firearm running a Picatinny end plate, which makes it a natural fit for AR pistol builds and plenty of other platforms.
What Sets This MI Side Folder Apart
The body is hard coat anodized 6061 aluminum, and the steel parts wear a mag phosphate finish, so this thing is built to take a beating and keep looking sharp. Folded up, it only adds about three quarters of an inch to your firearm, and it runs a complete assembly weight around 14.2 ounces. A steel clamp with large surface engagement handles the retention, giving you the kind of rigidity that a lot of aluminum-only folders just can't match.
Setting Up the Arm Brace Side-Folding Stock
One of the best touches here is that the mechanism can be set up to fold either right or left, so lefties and righties both get a clean layout that keeps the folded stock out of the way of ejection ports and controls. Five QD sling attachment points give you room to run your sling however you like, whether that's a single-point setup or a two-point carry. A Velcro strap comes in the box for dialing in the brace fit.
Folks who have run this one tend to point to the machining quality and the confident, solid lock-up. Fresh out of the box the spring tension can feel stiff when you go to fold it, but that stiffness is exactly what keeps everything tight and quiet once it breaks in. It's made in the USA and backed by the Midwest Industries lifetime warranty, which tells you they stand behind the build.
Key Specifications
- Manufacturer: Midwest Industries
- Manufacturer Part Number: MIARMSFODG
- UPC: 812102035367
- Color: O.D. Green
- Body Material: Hard Coat Anodized 6061 Aluminum
- Folding Mechanism: 4140 Heat-Treated Steel
- Steel Finish: Mag Phosphate
- Mounting Interface: Picatinny
- Fold Direction: Configurable Right or Left
- QD Sling Points: 5
- Added Length (Extended): 9 1/8 in
- Added Length (Folded): 0.75 in
- Assembly Weight: 14.2 oz
- Country of Origin: USA
- Warranty: Midwest Industries Lifetime Warranty
What’s Included
- Midwest Industries Arm Brace Side-Folding Stock (O.D. Green)
- Velcro strap
Frequently Asked Questions
What does the Arm Brace Side-Folding Stock mount to?
It attaches to firearms that have a Picatinny end plate or rail interface, which makes it a common pick for AR pistol builds. As long as your platform accepts a Picatinny attachment, this folder bolts right up. Builders have run it on everything from AR pistols to 10/22 pistol builds and various pistol-caliber platforms.
Can this side-folding brace be set up for left-hand folding?
Yes. The mechanism is configurable to fold either right or left, so you can set it up to keep the folded stock clear of your ejection port and controls no matter which hand you shoot with. That flexibility is one of the reasons builders like it over fixed-direction folders.
How much shorter does it make my firearm when folded?
Folded, it only adds about 0.75 inches to your overall length, which is a big space saver for range bags, cases, and vehicle storage. Extended, it adds roughly 9 1/8 inches. The whole assembly weighs about 14.2 ounces.
Is the folding action stiff at first?
A number of owners note the spring tension feels stiff right out of the box, which takes a little muscle to fold initially. That tension is by design and is what keeps the lock-up tight and rattle-free once it breaks in. Most folks find it loosens up to a comfortable feel with use.





Reviews
There are no reviews yet.