FLR

SA-15 Folding Lower Receiver — Integrated Folding Mechanism, Not An Adapter

Patented Innovation · Made in Montana, USA

The Only Lower That Folds.
Not An Adapter.

A US-patented folding mechanism machined directly into 7075-T6 billet aluminum — not a bolt-on hinge, not a compromise. Backed by a lifetime warranty and built in Bigfork, Montana.

US Patent Protected 7075-T6 Billet Aluminum No Adapter Required Lifetime Warranty
Questions? Contact Us
⛰ Designed, Machined, & Assembled in Bigfork, Montana
⬡
Integrated Folding Mechanism

Machined directly into the receiver — not an add-on hinge or clamp-on adapter

◆
US Patent Protected

Innovation you can expect from Shield Arms

❖
7075-T6 Billet Aluminum

Machined from solid billet for a tighter fit and more rigidity than forgings

★
Lifetime Warranty

Covered for life against defects in materials and workmanship, no questions asked

Choose Your Build

One Folding Lower. Three Ways to Own It.

From a stripped lower for your own build to a complete rifle or pistol, every FLR carries the same patented mechanism and lifetime warranty.

Stripped FLR

Just the folding lower receiver — build it your way with the upper, trigger, and furniture you already trust.

AR-15 / AR-9

Complete FLR Lower

Lower parts kit installed and ready to mate to your upper — skip the assembly, keep the fold.

AR-15 / AR-9

SA-15 / SA-9 Complete

A complete rifle or pistol-caliber build around the FLR, ready to run out of the box.

Complete Builds
View as Grid List
Sort by
Display per page
SA-9 FLR 7.5" Folding Pistol - 9mm - Black

SA-9 FLR 7.5" Folding Pistol - 9mm

Gen 2 SA-9 folding 9mm pistol built on Shield Arms Folding Lower Receiver. Accepts standard Glock double-stack magazines. 7.5" barrel, folds to 13" for compact storage. Last round bolt hold open, premium components. Ships with Mountain Partisan Sling. Made in USA, lifetime warranty.
$1,499.00
SA-15 Builders Kit - Black

SA-15 Builders Kit

Build your own custom folding AR-15 with Shield Arms SA-15 Builders Kit. Features patented Folding Lower Receiver with integrated folding mechanism - no adapter required. Includes 7075-T6 billet upper and lower receivers, 15" M-LOK handguard, carbine buffer tube, proprietary H2 buffer, and thread locker. Lighter, stronger, and more compact than traditional folding adapter systems. Custom in-house Cerakote in Black, Fallout, Montana Mud, or Pineland. Made in USA with lifetime warranty.
$599.95
SA-15 Complete Folding Lower Receiver w/Carbine Stock

SA-15 Complete Folding Lower Receiver w/Carbine Stock

Complete AR-15 lower receiver with patented built-in folding mechanism for compact storage. Features 7075-T6 billet construction, B5 Bravo stock, Enhanced Nickel Teflon Trigger, and saves .5+ lbs compared to adapter-based folding systems.
$545.00
SA-15 Complete Folding Lower Receiver w/Pistol Brace

SA-15 Complete Folding Lower Receiver w/Pistol Brace

Built-in folding AR-15 lower receiver with SBA3 brace. Precision machined 7075-T6 aluminum, saves 0.5+ lbs vs adapters. Made in USA with lifetime warranty.
$629.99
SA-15 Folding 11.5" Pro Pistol - 5.56 NATO - Black

SA-15 Folding 11.5" Pro Pistol - 5.56 NATO

The SA-15 Folding 11.5" Pro Pistol features Shield Arms' patented Folding Lower Receiver (FLR) that folds to just 20.5" without adapters. Built with 7075-T6 billet aluminum and backed by our lifetime warranty.
$1,499.95
SA-15 Folding 16" ELITE Rifle - Black

SA-15 Folding 16" ELITE Rifle

Ultimate custom folding AR-15 built on Shield Arms' patented Folding Lower Receiver - no adapter required. Made in USA, lifetime warranty.
$1,899.00
SA-15 Folding 16" PRO Rifle - Black

SA-15 Folding 16" PRO Rifle

Complete premium folding AR-15 built on Shield Arms' patented Folding Lower Receiver - no adapter required. Made in USA, lifetime warranty.
$1,499.00
SA-15 Stripped Folding Lower Receiver - Black

SA-15 Stripped Folding Lower Receiver

Patented SA-15 Stripped Folding Lower Receiver. No adapter required - revolutionary folding mechanism built into the receiver. 7075-T6 billet aluminum construction. Build your custom folding AR-15 rifle or pistol. Made in USA with lifetime warranty.
$375.00
SA-9 ASR Kit

SA-9 ASR Kit

Complete Active Shooter Response system featuring the folding SA-9 7.5" 9mm pistol with Eberlestock Apprentice backpack, Shield Arms IFAK, extended Glock magazines, and premium tactical components for discreet everyday carry.
$1,965.00
SA-9 Gen2 Stripped Folding Lower Receiver - 9mm

SA-9 Gen2 Stripped Folding Lower Receiver - 9mm

The SA-9 Gen2 is Shield Arms' patented folding lower receiver machined from 7075-T6 billet aluminum, designed to accept Glock double-stack 9mm magazines with integrated last-round bolt hold open and enhanced parts compatibility.
$399.99
Filters Close
Clear All
In Stock Clear
Firearms Manufacturer Clear
Firearms Model Clear
Categories