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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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2,384
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All SI Products (2,384)

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Buy Sig Sauer 8901331 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Rose Gold online Sig Sauer 8901331 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Rose Gold Buy Sig Sauer 8901330 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Rainbow online Sig Sauer 8901330 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Rainbow Buy Sig Sauer 8901327 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL online Sig Sauer 8901327 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Buy Sig Sauer 8901305 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Nickel online Sig Sauer 8901305 Safety Parts Kit 9mm Luger/380 ACP Sig P365/P365X/XL Nickel Buy Sig Sauer P226 XFive STAS 9MM 5in Stainless Steel 10rd Semi-Auto online Sig Sauer P226 XFive STAS 9MM 5in Stainless Steel 10rd Semi-Auto Buy Sig Sauer P226 X-Five Classic 9MM 5in Stainless Steel 10rd Semi-Auto online Sig Sauer P226 X-Five Classic 9MM 5in Stainless Steel 10rd Semi-Auto Buy Sig Sauer Tango6T DVO 1-6x24mm FFP Rifle Scope FDE online Sig Sauer Tango6T DVO 1-6x24mm FFP Rifle Scope FDE Buy Sig SAUER T300 Smart Target 5 Zone 5x3in Black Control Module (SC-T300) online Sig SAUER T300 Smart Target 5 Zone 5x3in Black Control Module (SC-T300) Buy Sig Sauer Tango-MSR 1-8x24mm Coyote Rifle Scope online Sig Sauer Tango-MSR 1-8x24mm Coyote Rifle Scope Buy Sig Sauer Tango MSR LPVO Rifle Scope 1-6x24mm Coyote online Sig Sauer Tango MSR LPVO Rifle Scope 1-6x24mm Coyote Buy Sig SAUER TANGO-MSR LPVO 1-10x28 34mm SFP MSR BDC10 Riflescope SOTM11200 online Sig SAUER TANGO-MSR LPVO 1-10x28 34mm SFP MSR BDC10 Riflescope SOTM11200 Buy Sig Sauer 8901268 Minimalist Plus Coyote Brown Aluminum Folding Stock online Sig Sauer 8901268 Minimalist Plus Coyote Brown Aluminum Folding Stock Buy Sig Sauer MCX MPX Skeletonized Stock Riser Cheek online Sig Sauer MCX MPX Skeletonized Stock Riser Cheek Buy Sig Sauer Barrel & Gas Block Assembly MCX 5.56 16 online Sig Sauer Barrel & Gas Block Assembly MCX 5.56 16 Buy Sig Sauer SOFR1FS0 Foxtrot-MSR 1350 Lumen Weapon Light Black Aluminum online Sig Sauer SOFR1FS0 Foxtrot-MSR 1350 Lumen Weapon Light Black Aluminum Buy Sig Sauer SOFR1CM0 Foxtrot-MSR 1350 Lumen Weapon Light, Black Aluminum online Sig Sauer SOFR1CM0 Foxtrot-MSR 1350 Lumen Weapon Light, Black Aluminum Buy Sig Sauer P365-XMACRO OWB Holster, Left Hand, Black online Sig Sauer P365-XMACRO OWB Holster, Left Hand, Black Buy Sig Sauer P365-XMACRO OWB Holster Black Right Hand Thermal Plastic online Sig Sauer P365-XMACRO OWB Holster Black Right Hand Thermal Plastic Buy Sig Sauer P365-XMACRO IWB Holster, Black, Left Hand online Sig Sauer P365-XMACRO IWB Holster, Black, Left Hand Buy Sig Sauer 8901243 Blackpoint Tactical OWB Holster Coyote Tan Right Hand online Sig Sauer 8901243 Blackpoint Tactical OWB Holster Coyote Tan Right Hand Buy Sig SAUER P229 Legion 9mm 3.9in X-Ray 3x10rd Cerakote Elite Gray Pistol online Sig SAUER P229 Legion 9mm 3.9in X-Ray 3x10rd Cerakote Elite Gray 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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