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SI designs rugged, user-focused firearm components and optics. They make accessories like slide plates, charging handles, barrel clamps, red dots, and shotgun parts.
All SI Products (2,381)
Sig Sauer E6MMCM220 Marksman Elite 6mm Creedmoor 107 gr OTM 20 Bx
Sig Sauer W320F-9-BXR3-PRO P320 9mm 4.7" Nitron Semi-Auto Pistol
Sig Sauer P320 Pro Carry LE 9mm 3.9 in 10rd Stainless
Sig Sauer W320C-9-BXR3-PRO P320 Pro 9mm 3.6" Nitron Semi-Auto Pistol
Sig SAUER OSCAR8 27-55x80mm HDX Lens Angled FDE Spotting Scope (SOO82001)
Sig Sauer TANGO6T 1-6x24mm Rifle Scope FFP DWLR6 Reticle
Sig Sauer Modx-9 9mm Suppressor 7.5" Black
Sig SAUER MODX-45 45 ACP Black Titanium Suppressor
Sig Sauer 1811268-R Taper Cap, PCC Barrels, Anodized Black Finish
Sig Sauer AIRPFMCXAEG MCX AEG 6mm 120rd Black Airsoft Rifle
Sig Sauer P320 M18 9mm Luger 3.9" Barrel Coyote PVD Finish Stainless Steel
Sig Sauer P320 Grip Module X-Series Compact Small Coyote Polymer 9mm 40 ...
Sig Sauer Gripmodxc943smblk P320 Grip Module GRIP-MODX-C-943-SM-BLK
Sig SAUER 320X Compact Black Grip Module Large Synthetic 9/40/357 - GRIP-MODX-C-943-LG-BLK
Sig Sauer P320c X Series MD 9/40 Coyote Grip Module Enhances Pistol Look & Feel
Sig Sauer GRIPMODXC943MBLK P320 X-Compact Medium Grip Module Black
Sig Sauer P365 Flat Trigger Model: KIT365FLATTRIGGER
Sig Sauer P938 Legion Magazine 9mm Luger 7 Rounds Stainless
Sig Sauer MAG-238-380-7-LEGION P238 380 ACP 7-Round Extended Magazine
Sig Sauer AMPFM17GG M17 Proforce Airgun 6mm 21rd Green Gas Magazine
Sig Sauer AMPFM17 M17 Proforce Airgun 6mm 21rd Polymer Black/Brown
Sig Sauer AIRPFM17GG Proforce M17 Airsoft Pistol 6mm Green Gas Coyote
Sig Sauer AIRPFM17 Proforce M17 Airsoft CO2 6mm Coyote Polymer Grips
Sig Sauer Airguns AIR-RATTLER-BB MCX Rattler CO2 177 4.5mm Steel BB 30r...
Sig Sauer SPEC1-LIGHT-GREASE-15CC 15cc NLGI-1 Non-Toxic Synthetic Grease
Sig Sauer SPEC1-4OZ 4oz Synthetic Anti-Wear Firearm Lubricant
Sig Sauer SPEC1-2OZ-COMBOPACK 3x2oz Solvent, Cleaner & Anti-Wear Lube
Sig Sauer P320 M17 9mm Coyote PVD Pistol
Sig Sauer AMPF-229 Airsoft Proforce P229 Green Gas BB Magazine
Sig Sauer AIR-PF-229 Proforce P229 Airsoft 6mm Green Gas, 23 Rds, Black
Sig Sauer TANGO6T 1-6x24mm FDE Rifle Scope
Sig Sauer E243H1-20 Elite .243 Win 80GR Copper 20RDS Hunting Ammo
Sig Sauer E270H1-20 Elite Copper 270 Win 130GR 20RDS Hunting Ammo
SIG Airgun Magazine AMPC-177-M17C .177 20RD with CO2 Housing
Sig Sauer AMPC-177-M17 Airgun M17 Rotary Belts .177 20Rd 2-Pack
Sig Sauer Elite Ball 9mm +P 124gr FMJ Brass Cased Pistol Ammo 50 Rounds
Sig Sauer SOT65114 Tango6 5-30x56mm Riflescope, Illuminated MRAD Reticle
Sig Sauer SOW34201 Whiskey3 4-12x50mm Quadplex Reticle Scope Black
Sig Sauer P320 9mm 21-Round Magazine Coyote Tan
Sig SAUER P320 M17 Full Size Coyote 9mm 17rd Magazine (MAG-MOD-F-9-17-COY)
Sig SAUER SIGMPX 9MM PISTOL 3.5IN PDW COY SEMI PCB
SIG Sauer M400 TREAD Aluminum Sight Rail Black
Sig Sauer KITTRDGRIPVEERTICALBLK Tread Vertical Grip Barricade Stop Black
Sig Sauer E3006M2-20 Elite Match 30-06 175GR OTM 20RDS
Sig SAUER Elite Copper Hunting .30-06 Springfield 150 Grain 20rd Box Ammo
M400 Tread Enhanced 15in MLK Black Handguard
Sig Sauer HGRDTRDE13MLOKBLK 13" M-LOK Handguard Black Aluminum
Sig Sauer Tread M400 Adjustable Flip-Up Sight for AR-15 Rifle - Black
About SI
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.
Hot SI Items June 2026
Trending right now based on the last 30 days of TheGunDock orders + page views.
SilencerCo Sparrow 22 Rimfire Suppressor 22LR 5.08" Stainles
SIG SAUER 322C-ROSE-RS P322 Rose 22 LR 4" Black Anodize Semi
Sig Sauer Tango-MRS Compact Rifle Scope 1-6x24 30mm SFP BDC6
Sig Sauer Cross Sawtooth Rifle 6.5 PRC 22 inch Moss Green Fo
Sig Sauer W365XL-9-BXR3P-MS P365 XL 9mm 3.7" Nitron Semi-Aut
Sig Sauer 2401191R Picatinny Stock Adapter for AR-15, Alumin
Sig Sauer SORX1080 24MM Black Pro Optics Ready Sight
SIG SAUER E26R-9-BSS-FBZ P226 Full-Size 9mm 4.4" 2-Tone Bron
Shop SI Products
Sig SAUER MCX-SPEAR 6.8x51mm SBR 13in Semi-Auto Rifle RSPEAR
SilencerCo Sparrow 22 Rimfire Suppressor 22LR 5.08" Stainles
Sig Sauer P320 FLUX 9MM 3.9" 30RD Legion 320
Sig Sauer SLH300TIQD 300 Blackout Titanium Suppressor
SilencerCo Velos LBP 5.56 NATO/.223 4.76 In Low Back-Pressur
SIG SAUER MCX Spear SBR 7.62x51mm 13" Nitride NFA
Sig Sauer P365X Macro Tacops 9mm 3.7" 17rd Pistol
Sinclair INTERNATIONAL DIAL INDICATOR .001
Sig Sauer ROMEO1 Black Shroud Kit SOR1SK001: Medium Size, Ne
Sig Sauer 8900823 LTXG Grip Module Laser Engraved P320-X Car
Sig Sauer MCX-SPEAR LT AR Conversion Kit 5.56 NATO 11.5" Bla
Sig SAUER MCX 5.56 NATO 16in 30rd IR Cerakote FDE Rifle RMCX
SI News & Articles
Firearm Shipping Restrictions by State (2026 Update)
State-by-state guide to firearm and ammunition shipping for online buyers and FFL dealers. Current as of May 2026. Cover...
Damaged in Transit: How TheGunDock Handles Shipping Claims on Firearms and Ammo
When a firearm or ammo shipment arrives damaged, the claim process matters. TheGunDock walks through what to do, what we...
The Springfield KUNA: Roller-Delayed 9mm Pistol That's Shaking Up the PDW Market
The Springfield Armory KUNA — a roller-delayed 9mm pistol built in partnership with Croatia's HS Produkt — has becom...
The Strait of Hormuz: 2,500 Years of Trade, Arms, and Conflict
A twenty-one-mile-wide choke point has shaped the movement of goods — and weapons — across half the ancient and mode...
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