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"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)
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7,545
Products
2,381
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Founded
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All SI Products (2,381)

Buy Sig Sauer 226RM9LEGIONR2 P226 9mm 10+1 4.40" Optic Ready Serrated online Sig Sauer 226RM9LEGIONR2 P226 9mm 10+1 4.40" Optic Ready Serrated Buy Sig Sauer P220 Legion .45 ACP 4.4" 8-Rounds online Sig Sauer P220 Legion .45 ACP 4.4" 8-Rounds Buy Sig Sauer 8901206 P365-XMACRO 17rd 9mm Magazine Coyote Tan online Sig Sauer 8901206 P365-XMACRO 17rd 9mm Magazine Coyote Tan Buy Sig MCX Rattler 5.56 Pistol 5.5" 30rd. Black online Sig MCX Rattler 5.56 Pistol 5.5" 30rd. Black Buy Sig Sauer E225VP4020 22-250Rem 40gr Extreme Expansion Tip 20/Box online Sig Sauer E225VP4020 22-250Rem 40gr Extreme Expansion Tip 20/Box Buy Sig Sauer P365-380 Semi-Auto Pistol, Robin's Egg Blue, Nickel Slide, 10-Round online Sig Sauer P365-380 Semi-Auto Pistol, Robin's Egg Blue, Nickel Slide, 10-Round Buy SIG P365-XMACRO 9mm 3.7" 17rd Black Pistol online SIG P365-XMACRO 9mm 3.7" 17rd Black Pistol Buy Sig Sauer 8901182 P365-XMACRO Grip Module 9mm 17rd Mags Manual Safety online Sig Sauer 8901182 P365-XMACRO Grip Module 9mm 17rd Mags Manual Safety Buy SIG SAUER P365 X-Macro Compact 9mm Coyote Brown Grip Module (8901181) online SIG SAUER P365 X-Macro Compact 9mm Coyote Brown Grip Module (8901181) Buy Sig Sauer P365-XMacro Grip Module Black online Sig Sauer P365-XMacro Grip Module Black Buy Sig Sauer MPX Copperhead 9mm Pistol 3.5" Barrel Coyote online Sig Sauer MPX Copperhead 9mm Pistol 3.5" Barrel Coyote Buy Sig Sauer P365-380 Rainbow Titanium Micro-Compact 380ACP 3.1" XRAY-3 OR 10RD online Sig Sauer P365-380 Rainbow Titanium Micro-Compact 380ACP 3.1" XRAY-3 OR 10RD Buy Sig Sauer SOR44102 Romeo 4T Pro 1x20mm Red Dot Sight FDE 65 MOA Ring online Sig Sauer SOR44102 Romeo 4T Pro 1x20mm Red Dot Sight FDE 65 MOA Ring Buy Sig Sauer SOR44101 Romeo 4T Pro 1x20mm Red Dot Sight Matte Black online Sig Sauer SOR44101 Romeo 4T Pro 1x20mm Red Dot Sight Matte Black Buy Sig Sauer P365 MS HGA .380 Auto 3.1" Barrel SF Nitron Black XR3 Mod Poly Grip 2-10 Round Mags MA Comp online Sig Sauer P365 MS HGA .380 Auto 3.1" Barrel SF Nitron Black XR3 Mod Poly Grip 2-10 Round Mags MA Comp Buy Sig Sauer AIRT4 Air T4 Scope 1-4x24mm Mil-Dot Reticle Black online Sig Sauer AIRT4 Air T4 Scope 1-4x24mm Mil-Dot Reticle Black Buy Sig Sauer P365-XMACRO 9mm 3.7" 17rd Black online Sig Sauer P365-XMACRO 9mm 3.7" 17rd Black Buy Sig Sauer 8901168 P226 X-Five 9mm 20rd Black Steel Magazine online Sig Sauer 8901168 P226 X-Five 9mm 20rd Black Steel Magazine Buy Sig SAUER P226 XFIVE 20rd 9mm Extended Magazine w/ White Basepad (8901167) online Sig SAUER P226 XFIVE 20rd 9mm Extended Magazine w/ White Basepad (8901167) Buy Sig SAUER KILO Canyon 6x22mm Graphite Monocular (SOKCN606) online Sig SAUER KILO Canyon 6x22mm Graphite Monocular (SOKCN606) Buy Sig Sauer Venari 300 Win Mag 180 gr Soft Point Rifle Ammo online Sig Sauer Venari 300 Win Mag 180 gr Soft Point Rifle Ammo Buy Sig Sauer V7MMSP15420 Venari 7mmRemMag 154gr Soft Point 20 Rounds online Sig Sauer V7MMSP15420 Venari 7mmRemMag 154gr Soft Point 20 Rounds Buy Sig Sauer Venari 30-06 Springfield 165 gr Soft Point Rifle Ammo online Sig Sauer Venari 30-06 Springfield 165 gr Soft Point Rifle Ammo Buy Sig Sauer Venari 270 Win 130 gr Soft Point Ammo online Sig Sauer Venari 270 Win 130 gr Soft Point Ammo Buy Sig Sauer P365-XMACRO 9mm 3.1" Pistol, 17+1, Optic Ready, XRAY Sights online Sig Sauer P365-XMACRO 9mm 3.1" Pistol, 17+1, Optic Ready, XRAY Sights Buy SIG SAUER Zulu6 HDX 20x42 OIS Image Stabilized FDE Binocular (SOZ6WP20) online SIG SAUER Zulu6 HDX 20x42 OIS Image Stabilized FDE Binocular (SOZ6WP20) Buy SIG Sauer Tango-MSR 1-10x26mm Rifle Scope FFP online SIG Sauer Tango-MSR 1-10x26mm Rifle Scope FFP Buy Sig Sauer SOK18611 Buckmaster 1800 laser RF 6x22mm Red LED Blk online Sig Sauer SOK18611 Buckmaster 1800 laser RF 6x22mm Red LED Blk Buy Sig Sauer P365 X-Series 9mm 3.1in Coyote Brown Slide Assembly online Sig Sauer P365 X-Series 9mm 3.1in Coyote Brown Slide Assembly Buy Sig Sauer MPX 35rd 9mm Luger Magazine Black online Sig Sauer MPX 35rd 9mm Luger Magazine Black Buy SIG SAUER WHISKEY6 3-18x44mm 30mm Quadplex SFP Riflescope (SOW63114) online SIG SAUER WHISKEY6 3-18x44mm 30mm Quadplex SFP Riflescope (SOW63114) Buy Sig Sauer Whiskey6 3-18x44mm Quadplex Reticle Rifle Scope online Sig Sauer Whiskey6 3-18x44mm Quadplex Reticle Rifle Scope Buy Sig Sauer MPX Competition Carbine Semi-Automatic Rifle 9mm Luger online Sig Sauer MPX Competition Carbine Semi-Automatic Rifle 9mm Luger Buy Sig MPX 4.5" 9mm Black Pistol with Aluminum M-Lok Handguard and 35RD Mag online Sig MPX 4.5" 9mm Black Pistol with Aluminum M-Lok Handguard and 35RD Mag Buy Sig Sauer W365XL-9-BXR3P P365 XL 9mm 3.7" Nitron Semi-Auto Pistol online Sig Sauer W365XL-9-BXR3P P365 XL 9mm 3.7" Nitron Semi-Auto Pistol Buy Sig SAUER LTXG Grip Module Assembly for P320 XSeries (8901005) online Sig SAUER LTXG Grip Module Assembly for P320 XSeries (8901005) Buy Sig Sauer P210 9mm 8rd Steel Magazine online Sig Sauer P210 9mm 8rd Steel Magazine Buy Sig Sauer W220R-45-BSE P220 Elite 45 ACP 4.4" Nitron Semi-Auto Pistol online Sig Sauer W220R-45-BSE P220 Elite 45 ACP 4.4" Nitron Semi-Auto Pistol Buy Sig SAUER Tango-DMR 5-30x56mm Illum FFP MRAD DEV-L 2.0 Riflescope SOTD65112 online Sig SAUER Tango-DMR 5-30x56mm Illum FFP MRAD DEV-L 2.0 Riflescope SOTD65112 Buy Sig Sauer Tango-DMR 5-30x56mm 34mm SF Illuminated FFP MOA DEV-L online Sig Sauer Tango-DMR 5-30x56mm 34mm SF Illuminated FFP MOA DEV-L Buy Sig SAUER Tango-DMR 3-18x44 34mm FFP MRAD Milling 2.0 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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....

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