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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
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2,384
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Founded
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All SI Products (2,384)

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Stainless Steel Frame & Slide Rosewood Buy Sig Sauer BBL22919 P229 9mm Luger 3.90" Black Nitride Barrel online Sig Sauer BBL22919 P229 9mm Luger 3.90" Black Nitride Barrel Buy Sig Sauer P229 Enhanced Elite Compact 9mm Pistol online Sig Sauer P229 Enhanced Elite Compact 9mm Pistol Buy Sig Sauer Magazine P238 380 ACP 7Rd W/X-Grip Extended MAG2383807X online Sig Sauer Magazine P238 380 ACP 7Rd W/X-Grip Extended MAG2383807X Buy Sig Sauer Magazine P229 9mm 15Rd E2 & UPDATED Models MAG229915E2 online Sig Sauer Magazine P229 9mm 15Rd E2 & UPDATED Models MAG229915E2 Buy Sig Sauer Magazine P228/P229 9mm 10 Rounds MAG229910 online Sig Sauer Magazine P228/P229 9mm 10 Rounds MAG229910 Buy Sig Sauer Mag 380 ACP 6Rd Blue P238 Mag-238-380-6 online Sig Sauer Mag 380 ACP 6Rd Blue P238 Mag-238-380-6 Buy Sig Sauer P229 9mm Luger 3.90" Nitride Finish Steel Barrel for P228 online Sig Sauer P229 9mm Luger 3.90" Nitride Finish Steel Barrel for P228 Buy Sig Sauer Magazine 1911 Compact 45 ACP 7 Rounds Md: MAG1911457 online Sig Sauer Magazine 1911 Compact 45 ACP 7 Rounds Md: MAG1911457 Buy Sig Sauer Mag 45 ACP 10 Rounds Stainless P220 Mag-220-45-10 online Sig Sauer Mag 45 ACP 10 Rounds Stainless P220 Mag-220-45-10 Buy Sig Sauer Magazine 1911 45 ACP Fullsize Carry 8Rd MAG1911458 online Sig Sauer Magazine 1911 45 ACP Fullsize Carry 8Rd MAG1911458 Buy Sig Sauer Mag 357 40 S&W 10 Rounds Blue P229 Mag-229-43-10 online Sig Sauer Mag 357 40 S&W 10 Rounds Blue P229 Mag-229-43-10 Buy Sig Sauer P226 Magazine .40 S&W/.357 SIG 15rd Steel Blued online Sig Sauer P226 Magazine .40 S&W/.357 SIG 15rd Steel Blued Buy Sig SAUER Mags 9MM 20Rd Blue P226 MAG-226-9-20 online Sig SAUER Mags 9MM 20Rd Blue P226 MAG-226-9-20 Buy Sig Sauer P226 9mm Threaded Barrel M13.5x1 LH Black online Sig Sauer P226 9mm Threaded Barrel M13.5x1 LH Black Buy Sig Sauer P226 Magazine 9mm 15rd Steel Blued online Sig Sauer P226 Magazine 9mm 15rd Steel Blued Buy Sig Sauer Mag 9MM 10 Rounds Blue P226 Mag-226-9-10 online Sig Sauer Mag 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Sig Sauer P229 Barrel 357 SIG 3.9" Blued online Sig Sauer P229 Barrel 357 SIG 3.9" Blued Buy Sig Sauer BBL22940 P229 3.9" .40 S&W Black Nitride Steel Barrel online Sig Sauer BBL22940 P229 3.9" .40 S&W Black Nitride Steel Barrel Buy Sig Sauer 10 Round Blue Magazine For Model 2022 Caliber 9MM MAG2022910 online Sig Sauer 10 Round Blue Magazine For Model 2022 Caliber 9MM MAG2022910 Buy Sig Sauer Mag 45 ACP 8Rd Stainless P220 Mag-220-45-8 online Sig Sauer Mag 45 ACP 8Rd Stainless P220 Mag-220-45-8 Buy Sig Sauer SP2022 Magazine 40/357 10RD Steel Black online Sig Sauer SP2022 Magazine 40/357 10RD Steel Black Buy Sig Sauer MAG229913 9mm 13-Round Steel Pistol Magazine Blued Finish online Sig Sauer MAG229913 9mm 13-Round Steel Pistol Magazine Blued Finish Buy Sig Sauer MAG23998 P239 9mm 8-Round Steel Blued Magazine online Sig Sauer MAG23998 P239 9mm 8-Round Steel Blued Magazine Buy Sig Sauer P226 Magazine 10rd 40 S&W/357 SIG Stainless Steel Blued online Sig Sauer P226 Magazine 10rd 40 S&W/357 SIG Stainless Steel Blued

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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