Shield Arms SA-15 folding AR-15 rifle with the receiver folded Shield Arms SA-15 folding AR-15 rifle with the receiver folded
 

Patented Folding Lower Receiver

SA-15

The fold is built in. Not bolted on.

Shop the SA-15

Bigfork, Montana · Since 2017

Precision Firearms & Accessories, Machined in Montana

Shield Arms is a precision firearms and accessories manufacturer based in Bigfork, Montana, founded in 2017. We machine folding lower receivers, pistol magazines and extensions, magwells, and AR-15 lowers in our own shop, and back every one with a lifetime warranty.

Our Story → Lifetime Warranty → LE / MIL Sales →

What's Hot

Right Now at Shield Arms

Shield Arms S15 +10 magazine extension in black for Glock 43X/4825 Rounds

Pistol Mag Extensions · S-Series

S15 +10 Extension

Takes an S15 mag from 15 to 25 rounds. Billet 6061, 15-coil power spring included, tool-free floor plate. Runs with SA magwells.

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Shield Arms S15 Gen 3 15-round steel magazine for Glock 43X and 48Best Seller

Pistol Magazines · S-Series

S15 Gen 3 Magazine

The patented 15-round steel mag for the 43X/48. Flush-fit at OEM length, 50% more capacity. The original.

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Shield Arms M&P 2.0 +5 magazine extension in black

Pistol Mag Extensions · Smith & Wesson

M&P 2.0 +5 Extension

Five more rounds in your M&P 2.0. CNC-machined aluminum, drop-in on OEM mags, tools included.

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Shield Arms Springfield Echelon +5 magazine extension in black

Pistol Mag Extensions · Springfield

Springfield Echelon +5 Extension

17 to 22 rounds on the OEM Echelon mag. Billet 6061, easy-access floor plate, no new spring. USPSA legal at 141.25mm.

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Shield Arms magwells for Glock pistols

Faster Reloads

Magwells

Shield Arms pistol magazine extensions

More Rounds

Mag Extensions

Shield Arms S-Series, Z-Series and DS-Series pistol magazines

S-Series, Z-Series, DS-Series

Pistol Magazines

Shield Arms stripped AR-15 lower receivers

Build Your Own

Lower Receivers

Start With What You Carry

Shop by Platform

GlockMagazines · Extensions · Magwells

Smith & WessonMagazine Extensions · Revolver Optic Conversion

CZMagazine Extensions

Springfield ArmoryMagazine Extensions

SIG SauerCOMING SOON!

AR-15Accessories

Shooter aiming an SA-15 folding AR-15 rifle in the field
Folding Lower Receiver

The Fold Is Built In.
Not Bolted On.

Every adapter-based folding system on the market adds bulk, complexity, and a potential failure point. The Shield Arms FLR integrates the folding mechanism directly into the lower receiver — a patented design that no one else offers.

Patented Design 7075-T6 Billet No Adapter Needed Made in Montana Lifetime Warranty
Shop ALL FLR Products Stripped Lowers
Shield Arms SA-15 folding rifles and pistols

5.56 / 300 BLK

SA-15 Folding Rifles & Pistols

Shield Arms SA-9 folding 9mm pistol

9mm Pistol

SA-9 Folding Pistol

Lifetime Warranty

Every product we make, for as long as you own it. Defect in materials or workmanship, we replace it.

 Made in Montana

Designed, machined, and assembled in Bigfork. American materials, American labor.

 Patented Technology

The integrated folding lower receiver is ours alone. No adapter, no bolt-on, no one else.

 LE / MIL Trusted

Departmental pricing and direct sales support for law enforcement and military purchasers.

 Financing Available

Pay over time at checkout through Credova.

 Shipping & Returns

Free shipping over $100.

Weekly Deals Weekly Deals Recently restocked Shield Arms products Recently restocked Shield Arms products
Shield Arms
△ Made in Bigfork, Montana
Lifetime Warranty on Every Product
Our Story
News
View News Archive
28 May 2026 Lake County Sheriff's Office Selects Shield Arms SA-9 and SA-15 for Special Response Team
Shield Arms announces that the Lake County Sheriff's Office has chosen the SA-9 and SA-15 folding carbines for their Special Response Team following extensive testing.
29 Oct 2025 Shield Arms Revolver Optic Conversion Featured in Concealment Magazine Issue 47
The Shield Arms Revolver Optic Conversion (ROC) is featured in Concealment Magazine Issue 47 by Recoil. Discover how this revolutionary mounting system brings red dot optics to J-frame revolvers without gunsmithing or permanent modifications.
07 Oct 2025 Shield Arms Announces DS-Series Increased Capacity Magazines for Glock 9mm Pistols
Shield Arms Announces DS-Series Increased Capacity Magazines for Glock 9mm Pistols: DS-18 and DS-20 mags, increased capacity Glock 19 and Glock 17 magazines with over-insertion stop technology.
Featured Products
Shield Arms S15 Gen 3 - 15 Round Glock 43X/48 Magazine

S15 Gen 3 - 15-Round Steel Magazine for Glock 43X/48

The patented Shield Arms S15 Gen 3 is a flush-fitting 15-round steel magazine for Glock 43X/48, providing 50% more capacity than OEM 10-round magazines. Made in USA, lifetime warranty.
$39.99
Revolver Optic Conversion (R.O.C.) - right side

ROC - Revolver Optic Conversion

Revolutionary mounting system installs red dot sights on Smith & Wesson J-frame revolvers without gunsmithing or permanent modifications. Available in RMRcc and RMSc footprints. Made in USA with lifetime warranty.
$149.99
S20 - 20 Round Glock 43X/48 Magazine

S20 - 20 Round Glock 43X/48 Magazine

The Shield Arms S20 is a patented 20-round steel magazine for Glock 43X/48 — the highest-capacity backup mag available for the platform. Built on the S15's staggered feed geometry in a single steel body. QPQ finish, Made in USA, lifetime warranty.
$44.99
SA Premium Magwell - Glock 17 Gen 6 - Black

SA Premium Magwell - Glock 17 Gen 6

Professional-grade CNC-machined aluminum magwell engineered for Gen 6 Glock 17 and 45 pistols, featuring an optimized funnel design for championship-level reload speed. Made in USA with a lifetime warranty.
$115.00
Shield Arms carry magwell for Gen 6 Glock 17 with mounting screw and Allen wrench

SA Carry Magwell - Glock 17 Gen 6

The Shield Arms Carry Magwell for Gen 6 Glock 17 and 45 delivers faster, more reliable reloads without the bulk of a competition magwell. CNC-machined from 6061-T6 aluminum, its low-profile funnel design improves magazine insertion speed for everyday carry and duty use. Drop-in installation. Made in USA. Lifetime warranty.
$110.00
Black anodized Gen 6 Glock 19 Carry Magwell

SA Carry Magwell - Glock 19 Gen 6

The Shield Arms Carry Magwell for Gen 6 Glock 19 delivers faster, more reliable reloads without the bulk of a competition magwell. CNC-machined from 6061-T6 aluminum, its low-profile funnel design improves magazine insertion speed while maintaining holster compatibility for everyday carry and duty use. Drop-in installation. Made in USA. Lifetime warranty.
$110.00
Anodized aluminum Gen 6 Glock 19 Premium Magwell

SA Premium Magwell - Glock 19 Gen 6

CNC-machined 6061-T6 aluminum magwell engineered exclusively for the Gen 6 Glock 19. Maximum-opening funnel geometry delivers the fastest, most consistent reloads available for the compact Glock platform—built for USPSA, IPSC, and high-volume tactical training. Drop-in installation. Made in USA. Lifetime warranty.
$115.00
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 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
Bestsellers
Shield Arms S15 Gen 3 - 15 Round Glock 43X/48 Magazine

S15 Gen 3 - 15-Round Steel Magazine for Glock 43X/48

The patented Shield Arms S15 Gen 3 is a flush-fitting 15-round steel magazine for Glock 43X/48, providing 50% more capacity than OEM 10-round magazines. Made in USA, lifetime warranty.
$39.99
S15 Combo Pack 1 - Nitrocarb

S15 Combo 1

Shield Arms S15 Combo 1: Complete upgrade kit with 3x S15 Gen 3 15-round magazines and 1x steel mag catch for Glock 43X/48. Everything needed to increase capacity by 50% while maintaining flush-fit concealability. Made in USA, lifetime warranty + Spring for Life guarantee.
$122.00
Standard S15 Mag Catch for Glock® 43X / 48 - Black

Standard S15 Mag Catch for Glock 43X / 48

Essential steel magazine catch for Shield Arms S15 15-round magazines. Prevents wear when using steel magazines, ensures reliable retention and drop-free operation. Ambidextrous design with lower profile ideal for concealed carry. Black nitride finish, easy installation, lifetime warranty. Made in USA.
$12.00
Shield Arms Carry Magwell - Glock® 43X/48 - Black

SA Carry Magwell - Glock 43X/48

Ultra-low profile magwell specifically designed for Glock 43X and 48 everyday carry. Precision CNC-machined aluminum with hard anodized finish. Rounded no-snag edges for comfortable all-day carry, especially AIWB. Improves reload speed and consistency without compromising concealability. Drop-in installation with included hardware. Compatible with Shield Arms S15 magazines, OEM Glock magazines, and Shield Arms extensions. Made in USA, lifetime warranty.
$74.99
S15 Starter Kit - Nitrocarb

S15 Starter Kit

Complete upgrade kit: (1) S15 Gen 3 15-round magazine + (1) Standard steel mag catch. Everything needed to upgrade your Glock 43X/48 from 10 to 15 rounds. Save $10 vs buying separately. Lifetime warranty + Spring for Life guarantee. Made in USA.
$44.99
Premium S15 Steel Mag Catch for Glock® 43X / 48 - Nitride

Premium S15 Steel Mag Catch for Glock 43X/48

Premium hand-specific steel mag catch for Shield Arms S15 magazines. Enhanced ergonomics with extended knurling, beveled edges for smooth reloads, and increased magazine engagement. Not compatible with OEM magazines. Select left or right hand. Made in USA, lifetime warranty.
$36.99
Shield Arms S15 +5 Magazine Extension - Black

Shield Arms S15 +5 Magazine Extension

The Shield Arms S15 +5 Magazine Extension adds 5 rounds to your S15 magazine for a total of 20 rounds. Maximum capacity for competition, home defense, and range use. Lifetime warranty.
$39.99
Glock® 17/22/34/35/19X/45 +5/4 Mag Extension - Black

Glock 17/22/34/35/19X/45 +5/4 Mag Extension

Shield Arms +5/4 magazine extension for Glock 17/22/34/35/19X/45. Precision-machined aluminum construction adds 5 rounds (9mm) or 4 rounds (.40/.357) without compromising reliability. Easy installation, lifetime warranty. Made in USA.
$39.99