Buy SI Online

"Innovative firearm accessories engineered for performance"

SI designs rugged, user-focused firearm components and optics. They make accessories like slide plates, charging handles, barrel clamps, red dots, and shotgun parts.

5.0★★★★★(82 verified SI reviews)
Shop All SI Products
7,545
Products
2,384
In Stock
-
Founded
USA
Origin

All SI Products (2,384)

Buy Sig Sauer W365XL-9-BXR3P-MS P365 XL 9mm 3.7" Nitron Semi-Auto Pistol online Sig Sauer W365XL-9-BXR3P-MS P365 XL 9mm 3.7" Nitron Semi-Auto Pistol Buy Sig Sauer SOR5X201 ROMEO5XDR Gen 2 1x20mm Red Dot Sight 2 MOA Black online Sig Sauer SOR5X201 ROMEO5XDR Gen 2 1x20mm Red Dot Sight 2 MOA Black Buy SIG SAUER P365XL Rose 9mm 3.1" Pistol online SIG SAUER P365XL Rose 9mm 3.1" Pistol Buy Sig SAUER M18X 9mm 3.9in 3x 21rd Mags Coyote Tan Pistol (M18X-9-RX) online Sig SAUER M18X 9mm 3.9in 3x 21rd Mags Coyote Tan Pistol (M18X-9-RX) Buy Sig P365 9mm Micro-Compact 10+1 Capacity, XRAY3 Sights, 3.1" Barrel online Sig P365 9mm Micro-Compact 10+1 Capacity, XRAY3 Sights, 3.1" Barrel Buy Sig Sauer 8901484 Grip Module P320-X Compact Manual Safety Coyote 9/40/357 online Sig Sauer 8901484 Grip Module P320-X Compact Manual Safety Coyote 9/40/357 Buy Sig Sauer 8901483 Grip Module P320-X Compact Manual Safety Black online Sig Sauer 8901483 Grip Module P320-X Compact Manual Safety Black Buy Sig Sauer P320 M17 Grip Module 9/40/357 Manual Safety Black 8901482 online Sig Sauer P320 M17 Grip Module 9/40/357 Manual Safety Black 8901482 Buy Sig SAUER P320 Full Size 9/40/357 Manual Safety Medium Coyote Grip 8901481 online Sig SAUER P320 Full Size 9/40/357 Manual Safety Medium Coyote Grip 8901481 Buy Sig SAUER P320 Full Size 9/40/357 Manual Safety Medium Black Grip 8901480 online Sig SAUER P320 Full Size 9/40/357 Manual Safety Medium Black Grip 8901480 Buy Sig Sauer 8901479 Grip Module P320-Compact Manual Safety Black 9/40/357 online Sig Sauer 8901479 Grip Module P320-Compact Manual Safety Black 9/40/357 Buy Sig SAUER Manual Safety Medium Blk Grip Module Assembly f/Sig Sauer 8901478 online Sig SAUER Manual Safety Medium Blk Grip Module Assembly f/Sig Sauer 8901478 Buy SIG SAUER 938-9-RBT2-AMBI P938 9mm Rainbow Titanium 3" Semi-Auto Pistol online SIG SAUER 938-9-RBT2-AMBI P938 9mm Rainbow Titanium 3" Semi-Auto Pistol Buy Sig SAUER P238 Micro-Compact 380 ACP 2.7in Siglite Sights 6rd SAO Pistol online Sig SAUER P238 Micro-Compact 380 ACP 2.7in Siglite Sights 6rd SAO Pistol Buy Sig SAUER RMCX-556N-16B-LT-B MCX-LT 16" Rifle 223 Rem/5.56 NATO Nitride online Sig SAUER RMCX-556N-16B-LT-B MCX-LT 16" Rifle 223 Rem/5.56 NATO Nitride Buy SIG P320 Spectre Comp Blackout 9mm 4.6" XRay3 Day/Night Sights online SIG P320 Spectre Comp Blackout 9mm 4.6" XRay3 Day/Night Sights Buy Sig Sauer SOZ80001 Zulu8 HDX 10x42mm Binoculars, Coyote Rubber Armor online Sig Sauer SOZ80001 Zulu8 HDX 10x42mm Binoculars, Coyote Rubber Armor Buy Sig Sauer MCX-SPEAR LT AR Conversion Kit 5.56 NATO 11.5" Black online Sig Sauer MCX-SPEAR LT AR Conversion Kit 5.56 NATO 11.5" Black Buy Sig Sauer MCX-SPEAR LT AR Conversion Kit 300 Blackout 9" Black UAMCX-300B-9B-L online Sig Sauer MCX-SPEAR LT AR Conversion Kit 300 Blackout 9" Black UAMCX-300B-9B-L Buy Sig Sauer 1911X 45AP 8+1 X-Ray3 Sights Coyote Tan PVD 5" online Sig Sauer 1911X 45AP 8+1 X-Ray3 Sights Coyote Tan PVD 5" Buy Sig Sauer 1911X 45AP 8+1 Black DLC X-Ray3 Sights G10 Grips 5" Barrel online Sig Sauer 1911X 45AP 8+1 Black DLC X-Ray3 Sights G10 Grips 5" Barrel Buy Sig Sauer WPMCX-762R-11B-LT MCX Rattler LT 7.62x39mm 11.5" Black Pistol online Sig Sauer WPMCX-762R-11B-LT MCX Rattler LT 7.62x39mm 11.5" Black Pistol Buy Sig Sauer WPMCX-556N-9B-LT MCX Rattler LT 223/5.56 9" Black Pistol online Sig Sauer WPMCX-556N-9B-LT MCX Rattler LT 223/5.56 9" Black Pistol Buy Sig SAUER Whiskey4 5-20x50mm FFP Illuminated MOA Milling Hunter 2.0 Reticle online Sig SAUER Whiskey4 5-20x50mm FFP Illuminated MOA Milling Hunter 2.0 Reticle Buy SIG SAUER Whiskey 4 5-20x50mm Rifle Scope FFP MOA Milling Hunter 2.0 online SIG SAUER Whiskey 4 5-20x50mm Rifle Scope FFP MOA Milling Hunter 2.0 Buy Sig Sauer Whiskey 4 SOW44002 4-16x44mm 30mm FFP Illuminated Matte Black online Sig Sauer Whiskey 4 SOW44002 4-16x44mm 30mm FFP Illuminated Matte Black Buy SIG SAUER Whiskey 4 4-16x44mm Rifle Scope FFP MOA Milling online SIG SAUER Whiskey 4 4-16x44mm Rifle Scope FFP MOA Milling Buy Sig Sauer Whiskey 4 SOW43002 3-12x44mm 30mm SFP Matte Black Scope online Sig Sauer Whiskey 4 SOW43002 3-12x44mm 30mm SFP Matte Black Scope Buy SIG SAUER Whiskey 4 3-12x44mm Rifle Scope BDC Black online SIG SAUER Whiskey 4 3-12x44mm Rifle Scope BDC Black Buy SIG SAUER P365-XMacro 9mm Luger 10rd Black Pistol Magazine (8901466) online SIG SAUER P365-XMacro 9mm Luger 10rd Black Pistol Magazine (8901466) Buy Sig Sauer 365XCA-9-COMP-10 P365X Macro Comp 9mm 3.1" Black 10-Rd online Sig Sauer 365XCA-9-COMP-10 P365X Macro Comp 9mm 3.1" Black 10-Rd Buy SIG P365XCA9BXR3MS10 9mm 3.7" 10+1 Black Optic-Ready Pistol online SIG P365XCA9BXR3MS10 9mm 3.7" 10+1 Black Optic-Ready Pistol Buy P365-XMACRO 9mm Compact Pistol 3.7" Barrel Optic Ready Slide online P365-XMACRO 9mm Compact Pistol 3.7" Barrel Optic Ready Slide Buy Sig SAUER Zulu Canyon Binoculars 10x42 FDE HD Glass Roof Prism IPX-7 Waterproof online Sig SAUER Zulu Canyon Binoculars 10x42 FDE HD Glass Roof Prism IPX-7 Waterproof Buy Sig SAUER Tango6T 1-6x24 30mm SFP FL-6 Illum FDE Riflescope w/ Alpha4 Mount online Sig SAUER Tango6T 1-6x24 30mm SFP FL-6 Illum FDE Riflescope w/ Alpha4 Mount Buy Sig Sauer MCX Spear Pistol 7.62x51 13in Barrel Coyote 20rd Semi-Auto online Sig Sauer MCX Spear Pistol 7.62x51 13in Barrel Coyote 20rd Semi-Auto Buy Sig Sauer H277SFOTM15520 Fury 277 150gr 20/Box 3000fps 3097ft-lbs online Sig Sauer H277SFOTM15520 Fury 277 150gr 20/Box 3000fps 3097ft-lbs Buy Sig Sauer 8901458 MCX/MPX Coyote Brown Aluminum Folding Stock online Sig Sauer 8901458 MCX/MPX Coyote Brown Aluminum Folding Stock Buy Sig SOZT1002 ZULUDMR Carbon Fiber Tripod online Sig SOZT1002 ZULUDMR Carbon Fiber Tripod Buy Sig Sauer SOZB1002 Zulu Binocular Adapter, Flat Dark Earth, Aluminum online Sig Sauer SOZB1002 Zulu Binocular Adapter, Flat Dark Earth, Aluminum Buy Sig Sauer P365 9mm 3.1 in Black Nitron 10 Round Semi-Auto Pistol online Sig Sauer P365 9mm 3.1 in Black Nitron 10 Round Semi-Auto Pistol Buy Sig Sauer P365-9-BXR3P 9mm 3.1in Black Nitride 10 Round Semi-Auto online Sig Sauer P365-9-BXR3P 9mm 3.1in Black Nitride 10 Round Semi-Auto Buy Sig Sauer M17X 9mm 4.7in Barrel Coyote 21rd Semi-Auto Pistol online Sig Sauer M17X 9mm 4.7in Barrel Coyote 21rd Semi-Auto Pistol Buy Sig SAUER P322 Compact 22LR Pistol, Fiber Optic Sights, Threaded Barrel online Sig SAUER P322 Compact 22LR Pistol, Fiber Optic Sights, Threaded Barrel Buy Sig Sauer SCT350 T300 Bullseye Hanging Target Black/White online Sig Sauer SCT350 T300 Bullseye Hanging Target Black/White Buy Sig Sauer SCT357 T300 Multi Zone Hanging Target Black/White online Sig Sauer SCT357 T300 Multi Zone Hanging Target Black/White Buy Sig Sauer SCT356 T300 4 Square Hanging Target Black/White online Sig Sauer SCT356 T300 4 Square Hanging Target Black/White Buy Sig Sauer SCT354 T300 IPSC Hanging Target Black/White Replacement online Sig Sauer SCT354 T300 IPSC Hanging Target Black/White Replacement

About SI

SI focuses on practical, performance-driven firearm accessories for a wide range of pistols, rifles, and shotguns. Their lineup includes slide adapter plates, latchless charging handles, barrel clamps, compact red dot optics, and dedicated shotgun components, built primarily from aluminum and hardened materials. Products are engineered with attention to fit, function, and ease of installation, aimed at shooters who want reliable upgrades without unnecessary complexity. SI supports competitive, tactical, and recreational shooters by offering parts that address common user needs and enhance firearm ergonomics and capability.

Headquarters

Established

-

Country of Origin

USA

History & Heritage

SI began as an American aftermarket parts maker aimed at providing functional, affordable upgrades and accessories for shooters. Over time the brand expanded its offerings across pistol, rifle, and shotgun platforms, becoming known for practical designs and broad compatibility.

Notable Products

Popular items include charging handles, slide adapter plates, red dot sights, barrel clamps, and shotgun conversion components.

Why Choose SI?

Choose SI for straightforward, well-engineered accessories that improve usability and durability without unnecessary complexity.

Ready to Shop SI?

Choose SI for straightforward, well-engineered accessories that improve usability and durability without unnecessary complexity....

Browse All Products
Your Data is Protected
256-bit SSL Encryption PCI Compliant Checkout Secure Payment Processing