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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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Buy Sig SAUER KILO6K HDX 10x42mm Sage Green Rangefinder Binocular (SOK6K106) online Sig SAUER KILO6K HDX 10x42mm Sage Green Rangefinder Binocular (SOK6K106) Buy Sig Sauer 8901559 P365XL 9mm Coyote Cerakote Stainless Steel Slide online Sig Sauer 8901559 P365XL 9mm Coyote Cerakote Stainless Steel Slide Buy Sig Sauer 8901558 P365xl 9MM Luger Black Cerakote Stainless Steel Serrated online Sig Sauer 8901558 P365xl 9MM Luger Black Cerakote Stainless Steel Serrated Buy SIG SAUER P320 M18 Carry 9mm Coyote PVD Semi-Auto Pistol online SIG SAUER P320 M18 Carry 9mm Coyote PVD Semi-Auto Pistol Buy SIG 320XF9BXR3RXX10 P320 9mm 4.7" 10+1 Black Optic Ready XFull online SIG 320XF9BXR3RXX10 P320 9mm 4.7" 10+1 Black Optic Ready XFull Buy SIG 320XC9BXR3RXX10 P320 9mm 3.6" 10+1 Black Optic Ready XCompact online SIG 320XC9BXR3RXX10 P320 9mm 3.6" 10+1 Black Optic Ready XCompact Buy Sig P320AXGF9LEGIONRXX10 9mm 3.9" 10+1 Legion Gray Optic Ready online Sig P320AXGF9LEGIONRXX10 9mm 3.9" 10+1 Legion Gray Optic Ready Buy P365 AXG LEGION Pistol: Alloy Macro Grip, G10 Panels, Optics Cut, XRAY Sights online P365 AXG LEGION Pistol: Alloy Macro Grip, G10 Panels, Optics Cut, XRAY Sights Buy Sig Sauer WE26R-9-BSE-RX-SAO P226 Elite 9mm 4.4" Nitron Semi-Auto Pistol online Sig Sauer WE26R-9-BSE-RX-SAO P226 Elite 9mm 4.4" Nitron Semi-Auto Pistol Buy Sig Sauer WE26R9BSERX P226 Elite 9mm 4.4" Nitron Semi-Auto Pistol online Sig Sauer WE26R9BSERX P226 Elite 9mm 4.4" Nitron Semi-Auto Pistol Buy Sig Sauer W320CA-40-BXR3-PRO P320 Carry Pro 40 S&W 3.9" Nitron Pistol online Sig Sauer W320CA-40-BXR3-PRO P320 Carry Pro 40 S&W 3.9" Nitron Pistol

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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