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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 (2,386)
Sig Sauer P226 Magazine 10rd 40 S&W/357 SIG Stainless Steel Blued
Strike Industries SMCAP320SV2BLK Modular Stock Alpha MKII Black Aluminum Fits Sig Sauer P320 Ambidextrous
Strike Industries P365-XM-MR Magazine Release Sig P365 X Macro Black Stainless Steel
SI SMCCP320EXTTG Extended Trigger Guard Tactical
Strike Industries SMCCP320EXTCH SMC Charlie Extended Charging Handle Compatible w/ Strike Modular Chassis Systems Sig Sauer P320 Black Ambidextrous
Strike Industries SMCCP320TRAIL SMC Charlie Top Rail Black Steel...
Strike Industries SMCCP320FRAMEBLK SMC Charlie 9mm/357Sig/40S&W
Strike Industries SG-OM-1301TAC-BK Black Aluminum Beretta 1301/A300 Shotgun
Strike Industries SOSEEKER Hexion Tech Red Dot Sight Black 3 MOA Reticle
Strike Industries SGBCL1301TACFDE Barrel Clamp For Beretta 1301/A300 Flat Dark Earth Aluminum
Strike Industries P365RMR Slide Adapter Plate Black 5.80" for Red Dot Sights
Strike Industries ARCMAGSFDE Angled Vertical Grip FDE Polymer M-LOK
Sightron S6 66010 Scope 10-60x56 ED 34mm Illuminated MOA-2FT
Sightron S6 66008 Scope 10-60x56 ED 34mm Side Wheel Illum MOA-2FT
Sightron 32008 S1 4-12x40mm Riflescope AO G2 MOA Matte Finish
Sightron 32007 S1 4-12x40mm Riflescope AO G2 Duplex Matte Finish
Sightron S1 4-12x40mm G2 HHR Hunter Holdover Riflescope
Sightron Scope 3.5-10x50 G2 Duplex Matte
Sightron 32003 S1 3-9x40mm Riflescope Mil-Dot Matte Second Focal Plane
Sightron Scope 3-9x40 G2 Duplex Matte
Sightron S1 1.75-5x32mm G2 Duplex Riflescope
Sightron 31019 Riflescope 3-9x32mm Rimfire Fine Crosshair Matte Finish
Sightron ST 30156 Scope SII 36x42 .125 Dot Target Knobs 1" Matte
Sightron SIII 28010 Scope 10-50x60mm MOA-2 IR, 30mm Tube, Zero-Stop, Black
Sightron SIII 28009 Scope 8-32x56 PLR 30mm SF MOA-2 IR Matte Black
Sightron 26015 S-TAC 4-20x50 Scope MOA-2 Target Knobs 30mm SF
Sightron S-TAC 26014 4-20x50 Scope Duplex Reticle 30mm Tube
Sightron Scope S-TAC 3-16x42 MOA-3 Target KNOBS
Sightron S-TAC 26012 Scope 3-16x42 Duplex Target Knobs 30mm SF
Sightron S-TAC 30mm Riflescope 1-7X24IRMH Md: 26000
Sightron 25184 SIII SS 45x45 Scope, Fine Crosshair, 30mm, Matte Black
Sightron SIIISS45X45EDTD Scope 45X45 .1 Dot 30mm SF Matte Black
Sightron SIII 8-32x56mm Long Range MOA-2 Reticle Matte Black Scope 25149
Sightron SIII 25139 Scope 10-50x60 Fine-X 30mm SF Black Matte
Sightron SIII 25138 Scope 10-50x60 Dot Reticle 30mm SF Black Matte
Sightron SIII 25003 Scope 10-50x60 MOA-2 Tactical Knobs 30mm SF Tube
Eikonic XI SBRN Xiphos 3.40" Tanto Nitro-V Blade, Coyote Brown G10 Handle
Eikonic XI6SB Xiphos 3.40" Tanto Nitro-V Blade, Micarta Handle
Sig SAUER Karak Satin Wharnecliffe Knife with Green Micarta Handle (KA-7SG)
Eikonic KA8BB Karak 3.25" Wharncliffe Nitro-V Blade, Micarta Handle
Eikonic TS8BB Tsuru 3.30" Tanto 154CM Blade, Micarta Handle
Eikonic VA9BBS Validus 3.78" M390 Blade, G10 Handle, Part Serrated
Sig SAUER Validus Two-Tone Satin/Stoash Modified Tanto Knife (VA-9SBT)
Eikonic VA9GT Validus 3.78" M390 Tanto Blade, Green Micarta Handle
Eikonic VA9BB Validus 3.78" M390 Blade, Black G10 Handle Folding Knife
Sig Macro TacOp Grip Module w/Factor Metal Magwell - Bulk Package
Sig Sauer P365 Outlander Black Handgun 9mm Luger 10rd Magazines(2) 3.1 Gold Barrel X-RAY 3 Sights Manual Safety
Sig Sauer P365 Outlander Blue Laser Handgun 9mm Luger 10rd Magazines(2) 3.1 Spectrum Barrel X-RAY 3 Sights Manual Safety
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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