The A3 Industries Triangle Folding Stock (A3 Industries part no. TS-PIC-A) is a retro-profile side-folder built in lightweight aluminum, finished in Black.

Key Specifications

• Built with a folding mechanism that lets the stock swing to the side for a shorter overall footprint.
• Measures 9 inches folded for compact storage or transport.
• Interfaces with a Picatinny rail-style receiver extension rather than a mil-spec/commercial buffer tube.
• Constructed from aluminum for a lighter, more rigid build than the polymer version of this stock.
• Finished in Black to match most AR-platform builds.
• Classified as a firearm part/accessory, not a regulated firearm itself — no FFL transfer required to purchase.

Frequently Asked Questions

How is this different from the polymer version? This stock is machined from aluminum for a lighter, stiffer build, while A3’s polymer version trades some rigidity for lower cost.

Does this fold for storage? Yes. The triangle stock folds to the side, shortening the rifle’s overall length for storage or transport.

What does this stock mount to? It interfaces with a Picatinny-style rail receiver extension rather than a standard round buffer tube, so confirm your lower’s extension type before ordering.

Buy the A3 Industries Triangle Folding Stock 9-inch Aluminum, Black

Order the A3 Industries Triangle Folding Stock 9-inch Aluminum, Black today for fast, insured shipping from a Lubbock, TX gun shop. Browse more A3 Industries parts in our AR Braces/Stocks category.