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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
Products
2,381
In Stock
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Founded
USA
Origin

All SI Products (2,381)

Buy SilencerCo ASR Active Spring Retention Mount Quick Attach/Detach System online SilencerCo ASR Active Spring Retention Mount Quick Attach/Detach System Buy SilencerCo 3-Lug Muzzle Device 5/8x24 9mm Black online SilencerCo 3-Lug Muzzle Device 5/8x24 9mm Black Buy SilencerCo AC2608 3-Lug Muzzle Device M13.5x1LH Threads 45 ACP online SilencerCo AC2608 3-Lug Muzzle Device M13.5x1LH Threads 45 ACP Buy SilencerCo 3-Lug Muzzle Device 1/2x36 9mm Black online SilencerCo 3-Lug Muzzle Device 1/2x36 9mm Black Buy SilencerCo 3-Lug Muzzle Device .578x28 .45 ACP Black online SilencerCo 3-Lug Muzzle Device .578x28 .45 ACP Black Buy SilencerCo AC2602 3-Lug Muzzle Device M13.5x1LH Threads 9mm online SilencerCo AC2602 3-Lug Muzzle Device M13.5x1LH Threads 9mm Buy SilencerCo 3-Lug Muzzle Device 45 ACP 5/8-24 Black online SilencerCo 3-Lug Muzzle Device 45 ACP 5/8-24 Black Buy SilencerCo Threaded Barrel For Sig P320 Compact 9m online SilencerCo Threaded Barrel For Sig P320 Compact 9m Buy SilencerCo AC2413 9mm Threaded Barrel 5.46" Black Nitride Stainless Steel online SilencerCo AC2413 9mm Threaded Barrel 5.46" Black Nitride Stainless Steel Buy SilencerCo 3-Lug Mount .45 Cal AC2448 online SilencerCo 3-Lug Mount .45 Cal AC2448 Buy SilencerCo 3-Lug Mount for Silencer Co Octane, Omega K, and Hybrid - Stainless Steel, Black Oxide Finish online SilencerCo 3-Lug Mount for Silencer Co Octane, Omega K, and Hybrid - Stainless Steel, Black Oxide Finish Buy SilencerCo AC2291 9mm Threaded Barrel 5.30" Black Nitride Stainless Steel online SilencerCo AC2291 9mm Threaded Barrel 5.30" Black Nitride Stainless Steel Buy SilencerCo AC2290 9mm Threaded Barrel 3.50" Black Nitride Stainless Steel online SilencerCo AC2290 9mm Threaded Barrel 3.50" Black Nitride Stainless Steel Buy SilencerCo AC2024 Threaded Barrel 5.10" 45 ACP Black Nitride Steel online SilencerCo AC2024 Threaded Barrel 5.10" 45 ACP Black Nitride Steel Buy SilencerCo AC2023 Threaded Barrel 9mm Luger 4.9 in Black Nitride online SilencerCo AC2023 Threaded Barrel 9mm Luger 4.9 in Black Nitride Buy Silencerco Bravo Anchor Brake .30 Caliber Recoil Reduction Grey online Silencerco Bravo Anchor Brake .30 Caliber Recoil Reduction Grey Buy SilencerCo AC1986 Suppressor Cover 7.5in FDE - Cordura Nylon Exterior, New Condition online SilencerCo AC1986 Suppressor Cover 7.5in FDE - Cordura Nylon Exterior, New Condition Buy SilencerCo AC1985 High Temp Suppressor Shield FDE 6 Inch online SilencerCo AC1985 High Temp Suppressor Shield FDE 6 Inch Buy SilencerCo High Temp Suppressor Cover 7.50" Compatible with Octane Saker... online SilencerCo High Temp Suppressor Cover 7.50" Compatible with Octane Saker... Buy SilencerCo AC1983 High Temp 6" Suppressor Cover - Black, 1600°F Heat Shield online SilencerCo AC1983 High Temp 6" Suppressor Cover - Black, 1600°F Heat Shield Buy SilencerCo 7.5" High Temp Suppressor Shield Grey AC1982 online SilencerCo 7.5" High Temp Suppressor Shield Grey AC1982 Buy SilencerCo AC1981 High Temp 6" Gray Suppressor Cover Nylon online SilencerCo AC1981 High Temp 6" Gray Suppressor Cover Nylon Buy SILENCERCO ASR .46 Caliber 11/16x24 Muzzle Brake (AC1961) online SILENCERCO ASR .46 Caliber 11/16x24 Muzzle Brake (AC1961) Buy SilencerCo Hybrid ASR Muzzle Brake .458 Caliber Black online SilencerCo Hybrid ASR Muzzle Brake .458 Caliber Black Buy SilencerCo AC1570 Hybrid ASR Muzzle Device 9mm online SilencerCo AC1570 Hybrid ASR Muzzle Device 9mm Buy Sightmark SM1804101 Wraith Mini Long Mount Black Aluminum Matte Finish online Sightmark SM1804101 Wraith Mini Long Mount Black Aluminum Matte Finish Buy Sightmark SM13142LR2 Presidio 5-30x56 30mm Scope Matte Black Illuminated online Sightmark SM13142LR2 Presidio 5-30x56 30mm Scope Matte Black Illuminated Buy Sightmark SM13141LR2 Presidio 3-18x50 30mm Scope Matte Black LR2 Reticle online Sightmark SM13141LR2 Presidio 3-18x50 30mm Scope Matte Black LR2 Reticle Buy Sightmark SM13140CR1 Presidio 1-6x24 30mm Scope Matte Black Illuminated online Sightmark SM13140CR1 Presidio 1-6x24 30mm Scope Matte Black Illuminated Buy Sightmark SM28004 Mini QD Battery Pack, Lithium-Polymer, Matte Black online Sightmark SM28004 Mini QD Battery Pack, Lithium-Polymer, Matte Black Buy Sightmark Wraith 4K 1x Monocular - High-Definition Night Vision online Sightmark Wraith 4K 1x Monocular - High-Definition Night Vision Buy Sightmark Mini Shot M-Spec M3 Solar Red Dot Sight 3 MOA IP67 Waterproof online Sightmark Mini Shot M-Spec M3 Solar Red Dot Sight 3 MOA IP67 Waterproof Buy Sightmark SM26033R 33X24MM Reflex Sight Optics Ready online Sightmark SM26033R 33X24MM Reflex Sight Optics Ready Buy Sightmark SM39047 6.5 Grendel Red Laser Boresight, Brass, 100-Yard Range online Sightmark SM39047 6.5 Grendel Red Laser Boresight, Brass, 100-Yard Range Buy Sightmark Mini Shot A-Spec M3 Micro Reflex Sight 1x33mm Black online Sightmark Mini Shot A-Spec M3 Micro Reflex Sight 1x33mm Black Buy Sightmark SM26041 Element Mini Solar Red Dot Sight 1x22mm 3 MOA Black online Sightmark SM26041 Element Mini Solar Red Dot Sight 1x22mm 3 MOA Black Buy Sightmark 26030 Volta Red Dot 1x28mm 2 MOA Solar/AAA Matte Black online Sightmark 26030 Volta Red Dot 1x28mm 2 MOA Solar/AAA Matte Black Buy Sightmark SM26045 Mini Shot A-Spec M1 Red Dot 2 MOA Matte Black 1x22x17mm online Sightmark SM26045 Mini Shot A-Spec M1 Red Dot 2 MOA Matte Black 1x22x17mm Buy Sightmark SM13138HDR Citadel 1-10x24 HDR Riflescope online Sightmark SM13138HDR Citadel 1-10x24 HDR Riflescope Buy Sightmark LoPro Mini Green Laser Sight - Flat Dark Earth online Sightmark LoPro Mini Green Laser Sight - Flat Dark Earth Buy SIGHTMARK LOPRO Flashlight & IR Green Laser Dark E online SIGHTMARK LOPRO Flashlight & IR Green Laser Dark E Buy Sightmark SM25012DE LoPro Mini Combo Flashlight & Green Laser 300 Lumens online Sightmark SM25012DE LoPro Mini Combo Flashlight & Green Laser 300 Lumens Buy Sightmark T-5 5x23mm Magnifier w/ LQD Flip Mount online Sightmark T-5 5x23mm Magnifier w/ LQD Flip Mount Buy Sightmark T-3 Magnifier 3x Red Dot Reflex Sight Co-Witness Mount online Sightmark T-3 Magnifier 3x Red Dot Reflex Sight Co-Witness Mount Buy Sightmark SM26018 Core Shot A-Spec Reflex Sight 5 MOA Red Dot Matte Black online Sightmark SM26018 Core Shot A-Spec Reflex Sight 5 MOA Red Dot Matte Black Buy Sightmark SM26017 Core Shot A-Spec FMS Reflex Sight Matte Black 1 x 28 ... online Sightmark SM26017 Core Shot A-Spec FMS Reflex Sight Matte Black 1 x 28 ... 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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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