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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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2,381
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Founded
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All SI Products (2,381)

Buy Sig Sauer E6MMCM220 Marksman Elite 6mm Creedmoor 107 gr OTM 20 Bx online Sig Sauer E6MMCM220 Marksman Elite 6mm Creedmoor 107 gr OTM 20 Bx Buy Sig Sauer W320F-9-BXR3-PRO P320 9mm 4.7" Nitron Semi-Auto Pistol online Sig Sauer W320F-9-BXR3-PRO P320 9mm 4.7" Nitron Semi-Auto Pistol Buy Sig Sauer P320 Pro Carry LE 9mm 3.9 in 10rd Stainless online Sig Sauer P320 Pro Carry LE 9mm 3.9 in 10rd Stainless Buy Sig Sauer W320C-9-BXR3-PRO P320 Pro 9mm 3.6" Nitron Semi-Auto Pistol online Sig Sauer W320C-9-BXR3-PRO P320 Pro 9mm 3.6" Nitron Semi-Auto Pistol Buy Sig SAUER OSCAR8 27-55x80mm HDX Lens Angled FDE Spotting Scope (SOO82001) online Sig SAUER OSCAR8 27-55x80mm HDX Lens Angled FDE Spotting Scope (SOO82001) Buy Sig Sauer TANGO6T 1-6x24mm Rifle Scope FFP DWLR6 Reticle online Sig Sauer TANGO6T 1-6x24mm Rifle Scope FFP DWLR6 Reticle Buy Sig Sauer Modx-9 9mm Suppressor 7.5" Black online Sig Sauer Modx-9 9mm Suppressor 7.5" Black Buy Sig SAUER MODX-45 45 ACP Black Titanium Suppressor online Sig SAUER MODX-45 45 ACP Black Titanium Suppressor Buy Sig Sauer 1811268-R Taper Cap, PCC Barrels, Anodized Black Finish online Sig Sauer 1811268-R Taper Cap, PCC Barrels, Anodized Black Finish Buy Sig Sauer AIRPFMCXAEG MCX AEG 6mm 120rd Black Airsoft Rifle online Sig Sauer AIRPFMCXAEG MCX AEG 6mm 120rd Black Airsoft Rifle Buy Sig Sauer P320 M18 9mm Luger 3.9" Barrel Coyote PVD Finish Stainless Steel online Sig Sauer P320 M18 9mm Luger 3.9" Barrel Coyote PVD Finish Stainless Steel Buy Sig Sauer P320 Grip Module X-Series Compact Small Coyote Polymer 9mm 40 ... online Sig Sauer P320 Grip Module X-Series Compact Small Coyote Polymer 9mm 40 ... Buy Sig Sauer Gripmodxc943smblk P320 Grip Module GRIP-MODX-C-943-SM-BLK online Sig Sauer Gripmodxc943smblk P320 Grip Module GRIP-MODX-C-943-SM-BLK Buy Sig SAUER 320X Compact Black Grip Module Large Synthetic 9/40/357 - GRIP-MODX-C-943-LG-BLK online Sig SAUER 320X Compact Black Grip Module Large Synthetic 9/40/357 - GRIP-MODX-C-943-LG-BLK Buy Sig Sauer P320c X Series MD 9/40 Coyote Grip Module Enhances Pistol Look & Feel online Sig Sauer P320c X Series MD 9/40 Coyote Grip Module Enhances Pistol Look & Feel Buy Sig Sauer GRIPMODXC943MBLK P320 X-Compact Medium Grip Module Black online Sig Sauer GRIPMODXC943MBLK P320 X-Compact Medium Grip Module Black Buy Sig Sauer P365 Flat Trigger Model: KIT365FLATTRIGGER online Sig Sauer P365 Flat Trigger Model: KIT365FLATTRIGGER Buy Sig Sauer P938 Legion Magazine 9mm Luger 7 Rounds Stainless online Sig Sauer P938 Legion Magazine 9mm Luger 7 Rounds Stainless Buy Sig Sauer MAG-238-380-7-LEGION P238 380 ACP 7-Round Extended Magazine online Sig Sauer MAG-238-380-7-LEGION P238 380 ACP 7-Round Extended Magazine Buy Sig Sauer AMPFM17GG M17 Proforce Airgun 6mm 21rd Green Gas Magazine online Sig Sauer AMPFM17GG M17 Proforce Airgun 6mm 21rd Green Gas Magazine Buy Sig Sauer AMPFM17 M17 Proforce Airgun 6mm 21rd Polymer Black/Brown online Sig Sauer AMPFM17 M17 Proforce Airgun 6mm 21rd Polymer Black/Brown Buy Sig Sauer AIRPFM17GG Proforce M17 Airsoft Pistol 6mm Green Gas Coyote online Sig Sauer AIRPFM17GG Proforce M17 Airsoft Pistol 6mm Green Gas Coyote Buy Sig Sauer AIRPFM17 Proforce M17 Airsoft CO2 6mm Coyote Polymer Grips online Sig Sauer AIRPFM17 Proforce M17 Airsoft CO2 6mm Coyote Polymer Grips Buy Sig Sauer Airguns AIR-RATTLER-BB MCX Rattler CO2 177 4.5mm Steel BB 30r... online Sig Sauer Airguns AIR-RATTLER-BB MCX Rattler CO2 177 4.5mm Steel BB 30r... Buy Sig Sauer SPEC1-LIGHT-GREASE-15CC 15cc NLGI-1 Non-Toxic Synthetic Grease online Sig Sauer SPEC1-LIGHT-GREASE-15CC 15cc NLGI-1 Non-Toxic Synthetic Grease Buy Sig Sauer SPEC1-4OZ 4oz Synthetic Anti-Wear Firearm Lubricant online Sig Sauer SPEC1-4OZ 4oz Synthetic Anti-Wear Firearm Lubricant Buy Sig Sauer SPEC1-2OZ-COMBOPACK 3x2oz Solvent, Cleaner & Anti-Wear Lube online Sig Sauer SPEC1-2OZ-COMBOPACK 3x2oz Solvent, Cleaner & Anti-Wear Lube Buy Sig Sauer P320 M17 9mm Coyote PVD Pistol online Sig Sauer P320 M17 9mm Coyote PVD Pistol Buy Sig Sauer AMPF-229 Airsoft Proforce P229 Green Gas BB Magazine online Sig Sauer AMPF-229 Airsoft Proforce P229 Green Gas BB Magazine Buy Sig Sauer AIR-PF-229 Proforce P229 Airsoft 6mm Green Gas, 23 Rds, Black online Sig Sauer AIR-PF-229 Proforce P229 Airsoft 6mm Green Gas, 23 Rds, Black Buy Sig Sauer TANGO6T 1-6x24mm FDE Rifle Scope online Sig Sauer TANGO6T 1-6x24mm FDE Rifle Scope Buy Sig Sauer E243H1-20 Elite .243 Win 80GR Copper 20RDS Hunting Ammo online Sig Sauer E243H1-20 Elite .243 Win 80GR Copper 20RDS Hunting Ammo Buy Sig Sauer E270H1-20 Elite Copper 270 Win 130GR 20RDS Hunting Ammo online Sig Sauer E270H1-20 Elite Copper 270 Win 130GR 20RDS Hunting Ammo Buy SIG Airgun Magazine AMPC-177-M17C .177 20RD with CO2 Housing online SIG Airgun Magazine AMPC-177-M17C .177 20RD with CO2 Housing Buy Sig Sauer AMPC-177-M17 Airgun M17 Rotary Belts .177 20Rd 2-Pack online Sig Sauer AMPC-177-M17 Airgun M17 Rotary Belts .177 20Rd 2-Pack Buy Sig Sauer Elite Ball 9mm +P 124gr FMJ Brass Cased Pistol Ammo 50 Rounds online Sig Sauer Elite Ball 9mm +P 124gr FMJ Brass Cased Pistol Ammo 50 Rounds Buy Sig Sauer SOT65114 Tango6 5-30x56mm Riflescope, Illuminated MRAD Reticle online Sig Sauer SOT65114 Tango6 5-30x56mm Riflescope, Illuminated MRAD Reticle Buy Sig Sauer SOW34201 Whiskey3 4-12x50mm Quadplex Reticle Scope Black online Sig Sauer SOW34201 Whiskey3 4-12x50mm Quadplex Reticle Scope Black Buy Sig Sauer P320 9mm 21-Round Magazine Coyote Tan online Sig Sauer P320 9mm 21-Round Magazine Coyote Tan Buy Sig SAUER P320 M17 Full Size Coyote 9mm 17rd Magazine (MAG-MOD-F-9-17-COY) online Sig SAUER P320 M17 Full Size Coyote 9mm 17rd Magazine (MAG-MOD-F-9-17-COY) Buy Sig SAUER SIGMPX 9MM PISTOL 3.5IN PDW COY SEMI PCB online Sig SAUER SIGMPX 9MM PISTOL 3.5IN PDW COY SEMI PCB Buy SIG Sauer M400 TREAD Aluminum Sight Rail Black online SIG Sauer M400 TREAD Aluminum Sight Rail Black Buy Sig Sauer KITTRDGRIPVEERTICALBLK Tread Vertical Grip Barricade Stop Black online Sig Sauer KITTRDGRIPVEERTICALBLK Tread Vertical Grip Barricade Stop Black Buy Sig Sauer E3006M2-20 Elite Match 30-06 175GR OTM 20RDS online Sig Sauer E3006M2-20 Elite Match 30-06 175GR OTM 20RDS Buy Sig SAUER Elite Copper Hunting .30-06 Springfield 150 Grain 20rd Box Ammo online Sig SAUER Elite Copper Hunting .30-06 Springfield 150 Grain 20rd Box Ammo Buy M400 Tread Enhanced 15in MLK Black Handguard online M400 Tread Enhanced 15in MLK Black Handguard Buy Sig Sauer HGRDTRDE13MLOKBLK 13" M-LOK Handguard Black Aluminum online Sig Sauer HGRDTRDE13MLOKBLK 13" M-LOK Handguard Black Aluminum Buy Sig Sauer Tread M400 Adjustable Flip-Up Sight for AR-15 Rifle - Black online Sig Sauer Tread M400 Adjustable Flip-Up Sight for AR-15 Rifle - Black

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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