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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)
SilencerCo AC5378 Corset Suppressor Cover Kevlar/Nomex Black 5.5"
SilencerCo SU5528 Spectre 9K 9mm/300 Blackout
SilencerCo AC5451 Charlie MAAD Brake 2.0 Black Anodized Aluminum 2.23" OAL 1.68" Diameter
SilencerCo AC5449 Bravo MAAD Brake 2.0 Black Anodized Aluminum 2.11" OAL 1.68" Diameter
SilencerCo AC5447 Alpha MAAD Brake 2.0 Black Anodized Aluminum 2" OAL 1.45" Diameter
SilencerCo Velos LBP 7.62 6.4 In 1/2x28 Black V-Series Cerakote
SilencerCo Bravo Titanium Thread Mount 5/8x24 AC5321 Accessory
SilencerCo Bravo Titanium Thread Mount 1/2x28 AC5320 Accessory
SilencerCo AC5364 ASR Black Nitride 1/2"x28 Threads 30 Cal
SilencerCo AC5390 Bravo Front Cap 30 Cal Fits Titanium Matte Black
SilencerCo AC5369 Threaded Barrel 9mm Luger Fits Sig P365XL Stainless St...
SilencerCo AC5367 9mm Threaded Barrel for Sig P365 Black Nitride 3.7"
SilencerCo Scythe-Ti .30 Cal Titanium Suppressor
SilencerCo ASR Flash Hider Closed Tine 223 Caliber
SilencerCo Compact Radial Brake 30 Caliber TOMD Compatible
SilencerCo Compact Radial Brake 30 Caliber for TOMD
SilencerCo Thread Over Muzzle BRK 1/2X28 .223Cal
SilencerCo AC5230 Bravo Thread Over Mount Black
SilencerCo Charlie Thread Over Mount Black for TOMD Compact
SilencerCo Velos LBP 5.56mm Suppressor - Low Back-Pressure, Full-Auto Rated
SilencerCo SU5185 Osprey 45 2.0 .45 ACP 7.90" L Black Aluminum/Stainless
SILENCERCO Osprey 9 2.0 Suppressor (SU5184)
SilencerCo AC5171 Corset Suppressor Cover Kevlar/Nomex Black 7.5"
SilencerCo Sil Suppressor Cover 6 Corset
SilencerCo AC5126 Bravo Front Cap 9mm Luger Black
SilencerCo AC5125 Bravo Front Cap .223 Cal Black
SilencerCo Bravo Front Cap .30 Cal Compatible with Omega 300 Hybrid 46
SilencerCo SU5085 Switchback 2.0 22 Cal Rimfire Titanium/Stainless Steel
SILENCERCO Hybrid 46m Supressor (SU5107)
SilencerCo AC5049 Threaded Barrel 3.70" 9mm Luger Stainless Steel Fits G...
SilencerCo AC4766 ASR Muzzle Brake Black Nitride 9/16x24 RH Threads 9mm
Silencerco Omega 36M Handgun Mount - Charlie Piston
SilencerCo SU4735 Omega 36M 36 Cal Black Cerakote
SilencerCo AC4749 Charlie Coupler Ring Tactical Accessory
SilencerCo AC4748 Charlie Direct Thread Mount Fits M18X1.5 Stainless Steel Oxide Black
SilencerCo AC4747 Charlie Direct Thread Mount Fits M18X1 Stainless Steel Oxide Black
SilencerCo AC4745 Charlie Direct Thread Mount Fits M13x0.75 Stainless Steel Oxide Black
SilencerCo AC4744 Charlie Direct Thread Mount 9/16x24
SilencerCo Charlie Direct Thread Mount AC4743, 5/8"-24 TPI, Omega 36M, Chimera 300, Saker ASR Versatility, Black Finish
SilencerCo Charlie Direct Thread Mount - AC4742 Accessory
SILENCERCO Charlie 1/2x28 Direct Thread Mount (AC4740)
SilencerCo AC4741 Charlie Direct Thread Mount Fits 11/16"x24 Stainless
SilencerCo Charlie Front Cap .30 Cal Black
SilencerCo Charlie Front Cap .223 Cal Black
SilencerCo AC2435 Bravo Direct Thread Mount Fits 9/16"x24 Matte Black
SILENCERCO 5/8x24 30 Cal ASR Single Port Muzzle Brake (AC2627)
SilencerCo AC2629 Alpha Direct Thread Mount M13x.75 tpi Steel Black
SilencerCo AC2631 ASR Muzzle Brake Black Nitride 3/4"x24 Threads 458 Cal
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 W365XL-9-BXR3P-MS P365 XL 9mm 3.7" Nitron Semi-Aut
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
Sierra Bullets 4540C 7mm 0.284 Caliber 140 Grain Tipped Boat
SilencerCo AC1278 ASR Black Nitride 9/16"x24 LH Threads 30 C
Sig Sauer W365XL-9-BXR3P-RXX P365 XL Romeo-X 9mm 3.7" Nitron
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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Choose SI for straightforward, well-engineered accessories that improve usability and durability without unnecessary complexity....
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