Description
The classic triangle silhouette used to be an AK thing, but A3 Industries opened it up to just about any platform with a rear M1913 Picatinny rail. This 9-inch polymer version gets you the iconic look and real folding function without the weight penalty, tipping the scale right around 10.4 ounces. Think AKs, the Ruger PC Charger, SIG MPX/MCX/Rattler, UTAS UT9, and similar builds that run a rear pic rail.
What Sets the A3 Triangle Folding Stock Apart
The body is injection-molded from 30% fiber-reinforced Zytel by DuPont, which is a long way from cheap plastic. The material rivals aluminum for rigidity while shaving weight and coming in easier on the wallet than the machined 6061 version. You get a rear textured butt-plate for grip against the shoulder, and an included steel QD sling cup that can be set up on either the left or right side depending on how you carry.
Folding and Lock-Up on the Triangle Stock
Deployment comes from an Apex heavy-duty steel tensioned hinge that positively latches in the open position and snaps back out of the fold quickly when you need it. It folds left or right and locks up solid, which is exactly what you want out of a folder that sees regular handling. Feedback from folks running these consistently points to easy installation and a tight, wobble-free lock.
Fit and Dimensions
Length runs 9 inches from the stock end to the hinge, stretching to 9.5 inches if you add the optional rubber butt-pad. There are two QD sling mounts up front, and A3 offers an optional injection-molded rubber cheek rest and butt-pad if you want more comfort behind glass. One thing worth knowing before you buy: this stock does not clear the charging handle on the ACE Galil or UZI PRO, so plan around those two platforms.
Key Specifications
- Manufacturer: A3 Industries
- Manufacturer Part Number: TS-PIC-P
- UPC: 810151870717
- Material: 30% Fiber-Reinforced Zytel Polymer (DuPont)
- Color: Black
- Mount Type: M1913 Picatinny (1913)
- Style: Folding (Left or Right)
- Length: 9" (9.5" with optional butt-pad)
- Weight: 10.4 oz (12.9 oz with optional butt-pad and cheek pad)
- Mount Height: 1.12" (excluding hinge)
- Mount Width: 1.00" (excluding hinge)
- Hinge: Apex Heavy-Duty Steel Tensioned
- Sling Mounts: Two QD sling points; reversible steel QD cup
What’s Included
- A3 Industries Triangle Folding Stock (polymer body)
- Steel 1913 Picatinny adapter/hinge
- Reversible steel QD sling cup (left or right)
Frequently Asked Questions
What firearms does the A3 Industries Triangle Folding Stock fit?
It mounts to any firearm with a rear M1913 Picatinny rail. Common setups include AKs, the Ruger PC Charger, SIG MPX/MCX/Rattler, and the UTAS UT9. Just note it does not clear the charging handle on the ACE Galil or UZI PRO.
Is the polymer version as strong as the aluminum triangle stock?
The polymer body is molded from 30% fiber-reinforced Zytel by DuPont, which rivals aluminum for rigidity. It comes in lighter and easier on the wallet than the machined 6061 aluminum model. For most builds you get the same rock-solid feel with less weight to lug around.
Can I run a sling on this triangle stock, and which side?
Yes. There are two QD sling mounts at the front of the stock, plus an included steel QD cup you can install on either the left or right side. That flexibility lets you set it up for whichever shoulder and carry style you prefer.
How does the folding hinge lock up?
The Apex heavy-duty steel tensioned hinge positively latches in the open position and deploys quickly out of the fold. It folds to either the left or right and locks up tight with minimal play. Users regularly report solid lock-up and straightforward installation.




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