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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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All SI Products (2,381)

Buy Sig SAUER Echo3 Thermal Reflex Sight 1-6x23mm Black online Sig SAUER Echo3 Thermal Reflex Sight 1-6x23mm Black Buy Sig Sauer P320 Grip Module 9mm 40 S&W 357 SIG Coyote Tan Medium online Sig Sauer P320 Grip Module 9mm 40 S&W 357 SIG Coyote Tan Medium Buy SIG Sauer P320 Grip Module: Coyote Finish, 9/40/357, Medium Size online SIG Sauer P320 Grip Module: Coyote Finish, 9/40/357, Medium Size Buy SIG Sauer P320 X-Series Medium Coyote Grip Module Upgrade 9/40 online SIG Sauer P320 X-Series Medium Coyote Grip Module Upgrade 9/40 Buy Sig Sauer Elite Hunter Tipped 6mm Creedmoor 100 gr CET Ammo online Sig Sauer Elite Hunter Tipped 6mm Creedmoor 100 gr CET Ammo Buy Sig Sauer 8900062 P365XL Grip Module 9mm Black Polymer online Sig Sauer 8900062 P365XL Grip Module 9mm Black Polymer Buy Sig Sauer E270TH220 Elite Hunter Tipped 270 Win 140 gr 2950 fps CET 20 Bx online Sig Sauer E270TH220 Elite Hunter Tipped 270 Win 140 gr 2950 fps CET 20 Bx Buy Sig Sauer P320 X-Five Legion 9mm 10-Round Magazine online Sig Sauer P320 X-Five Legion 9mm 10-Round Magazine Buy Sig SAUER 9mm 17rd Magazine For P320 X-FIVE Legion (8900060) online Sig SAUER 9mm 17rd Magazine For P320 X-FIVE Legion (8900060) Buy Sig Sauer E65CMTH120 Elite Hunter Tipped 6.5 Creedmoor 130 gr 2850 fps Controlled Expansion Tip (CET) 20 Bx online Sig Sauer E65CMTH120 Elite Hunter Tipped 6.5 Creedmoor 130 gr 2850 fps Controlled Expansion Tip (CET) 20 Bx Buy Sig Sauer Elite Hunter Tipped 30-06 Springfield 165 gr 2950 fps CET 20 Bx online Sig Sauer Elite Hunter Tipped 30-06 Springfield 165 gr 2950 fps CET 20 Bx Buy Sig SAUER P365/X/XL 9mm Luger 12rd Coyote Magazine (MAG-365-9-12-COY) online Sig SAUER P365/X/XL 9mm Luger 12rd Coyote Magazine (MAG-365-9-12-COY) Buy Sig SAUER 9mm 10rd Finger Extension Coyote Magazine For P365 Subcompact online Sig SAUER 9mm 10rd Finger Extension Coyote Magazine For P365 Subcompact Buy Sig Sauer MAG365910COY P365 9mm 10rd Coyote Brown Steel Magazine online Sig Sauer MAG365910COY P365 9mm 10rd Coyote Brown Steel Magazine Buy Sig Sauer P320 X-Series TXG Grip Module 9mm 4.70in Tungsten Polymer online Sig Sauer P320 X-Series TXG Grip Module 9mm 4.70in Tungsten Polymer Buy Sig Sauer P320X5 TXG Grip Module Kit Gray online Sig Sauer P320X5 TXG Grip Module Kit Gray Buy SIG Sauer Grip Module Assembly P320 Manual Safety 9mm/.40 S&W Small Black online SIG Sauer Grip Module Assembly P320 Manual Safety 9mm/.40 S&W Small Black Buy Sig Sauer P320 Carry Grip Module Assembly - Medium, Black online Sig Sauer P320 Carry Grip Module Assembly - Medium, Black Buy Sig Sauer 8900032 MCX 7.62x39 28-Round Black Steel Magazine online Sig Sauer 8900032 MCX 7.62x39 28-Round Black Steel Magazine Buy Sig Sauer SOR3M100 Romeo03 Max XL Mount Absolute Co-Witness online Sig Sauer SOR3M100 Romeo03 Max XL Mount Absolute Co-Witness Buy Sig Sauer P320 XFive Legion 9mm Pistol Stainless 5" Barrel TXG Grip 10rd online Sig Sauer P320 XFive Legion 9mm Pistol Stainless 5" Barrel TXG Grip 10rd Buy Sig Sauer P320 X-five Legion 9mm 17 + 5" barrel online Sig Sauer P320 X-five Legion 9mm 17 + 5" barrel Buy Sig Sauer 8900008 30-Round AR-15 Magazine 5.56 NATO Black Polymer online Sig Sauer 8900008 30-Round AR-15 Magazine 5.56 NATO Black Polymer Buy Sig Sauer Romeo1Pro 1x30mm Red Dot Sight 6 MOA FDE online Sig Sauer Romeo1Pro 1x30mm Red Dot Sight 6 MOA FDE Buy Sig Sauer P238 380 ACP 2.7" Barrel 6+1 CA Compliant Black Stainless online Sig Sauer P238 380 ACP 2.7" Barrel 6+1 CA Compliant Black Stainless Buy Sig Sauer P320 X-Series Grip Module Small 9mm 40 S&W 357 Coyote Polymer online Sig Sauer P320 X-Series Grip Module Small 9mm 40 S&W 357 Coyote Polymer Buy Sig Sauer GRIPMODXF943SMBLK P320 X-Series Grip Module Small Black Polymer online Sig Sauer GRIPMODXF943SMBLK P320 X-Series Grip Module Small Black Polymer Buy Sig Sauer GRIPMODXF943LGCOY P320 X-Series Large Coyote Grip Module online Sig Sauer GRIPMODXF943LGCOY P320 X-Series Large Coyote Grip Module Buy Sig Sauer P320 Grip Module X-Series Large Size Fits Full 9mm 40 S&W... online Sig Sauer P320 Grip Module X-Series Large Size Fits Full 9mm 40 S&W... Buy Sig Sauer GRIPMODXCA943SMCOY P320 X-Series Carry Grip Module Coyote Tan online Sig Sauer GRIPMODXCA943SMCOY P320 X-Series Carry Grip Module Coyote Tan Buy Sig Sauer GRIPMODXCA943SMBLK P320 X-Series Carry Grip Module Black Polymer online Sig Sauer GRIPMODXCA943SMBLK P320 X-Series Carry Grip Module Black Polymer Buy Sig SAUER P320 X-Series Carry 9/40/357 Large Black Grip Module Assy online Sig SAUER P320 X-Series Carry 9/40/357 Large Black Grip Module Assy Buy SIG SAUER Romeo1 Pro 6 MOA Dot Black Red Sight (SOR1P101) online SIG SAUER Romeo1 Pro 6 MOA Dot Black Red Sight (SOR1P101) Buy Sig Sauer Romeo1Pro Black 1x30mm 3 MOA Red Dot Sight online Sig Sauer Romeo1Pro Black 1x30mm 3 MOA Red Dot Sight Buy SIG SAUER Alpha1 Hunting Scope Ring Set 35mm Extra High Matte Black online SIG SAUER Alpha1 Hunting Scope Ring Set 35mm Extra High Matte Black Buy SIG SAUER Alpha1 Hunting Rifle Scope Rings 35mm High Matte Black online SIG SAUER Alpha1 Hunting Rifle Scope Rings 35mm High Matte Black Buy Sig SAUER Alpha1 Hunting Scope Ring Set 35mm Medium Black online Sig SAUER Alpha1 Hunting Scope Ring Set 35mm Medium Black Buy Sig SAUER Alpha1 1in Extra High 1.25in Aluminum Matte Black Scope Rings online Sig SAUER Alpha1 1in Extra High 1.25in Aluminum Matte Black Scope Rings Buy SIG SAUER Alpha1 1in Medium Aluminum Black Hunting Scope Rings (SOA10020) online SIG SAUER Alpha1 1in Medium Aluminum Black Hunting Scope Rings (SOA10020) Buy Sig Sauer SOA10019 Alpha 1 1 inch Low Scope Ring Set Matte Black Aluminum online Sig Sauer SOA10019 Alpha 1 1 inch Low Scope Ring Set Matte Black Aluminum Buy SIG Sauer Alpha1 34mm X-High Tactical Mount online SIG Sauer Alpha1 34mm X-High Tactical Mount Buy Sig Sauer P938 Micro-Compact Legion 9mm Luger 3" 10+1 Gray Cerakote Stainless Steel Black G10 Grip X-Ray3 Night Sight online Sig Sauer P938 Micro-Compact Legion 9mm Luger 3" 10+1 Gray Cerakote Stainless Steel Black G10 Grip X-Ray3 Night Sight Buy Sig Sauer Airguns AIRAMMOVPB22 Venom 22 Lead 250/Tin online Sig Sauer Airguns AIRAMMOVPB22 Venom 22 Lead 250/Tin Buy Sig Sauer Airguns AIRAMMODPB22 Dagger 22 Lead 250/Tin online Sig Sauer Airguns AIRAMMODPB22 Dagger 22 Lead 250/Tin Buy Sig Sauer Airguns AIRAMMODPB177 Dagger 177 Lead 500/Tin online Sig Sauer Airguns AIRAMMODPB177 Dagger 177 Lead 500/Tin Buy Sig Sauer AIR-S1-MPX-S Airsoft Rifle, Spring, 6mm BB, Adjustable Stock online Sig Sauer AIR-S1-MPX-S Airsoft Rifle, Spring, 6mm BB, Adjustable Stock Buy SIG Sauer Elite Hunting Copper 6mm Creedmoor Ammo 80gr online SIG Sauer Elite Hunting Copper 6mm Creedmoor Ammo 80gr Buy SIG SAUER BR6MMCM 6mm Creedmoor Brass 50/Bag online SIG SAUER BR6MMCM 6mm Creedmoor Brass 50/Bag

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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