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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
2,390
In Stock
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Founded
USA
Origin

All SI Products (2,390)

Buy Sierra A466906 GameChanger 30-06 Springfield 165 gr Tipped GameKing 20 Rds online Sierra A466906 GameChanger 30-06 Springfield 165 gr Tipped GameKing 20 Rds Buy Sierra A444003 GameChanger .270 Win 140 gr Tipped GameKing 20 Rounds online Sierra A444003 GameChanger .270 Win 140 gr Tipped GameKing 20 Rounds Buy Sierra GameChanger 6.5 Creedmoor 130 Grain Brass Cased Ammo 20 Rounds online Sierra GameChanger 6.5 Creedmoor 130 Grain Brass Cased Ammo 20 Rounds Buy Sierra A410302 GameChanger 243 Win 90 gr 3200 fps Tipped GameKing 20 Bx/10 Cs online Sierra A410302 GameChanger 243 Win 90 gr 3200 fps Tipped GameKing 20 Bx/10 Cs Buy Sinclair 608060400565 50 Caliber Nylon Rifle Brushes 12-Pack online Sinclair 608060400565 50 Caliber Nylon Rifle Brushes 12-Pack Buy Sinclair 608060400558 45 Cal 8-32M Bronze Brushes 12-Pack online Sinclair 608060400558 45 Cal 8-32M Bronze Brushes 12-Pack Buy Sinclair 608060400541 45 Caliber Nylon Rifle Brushes 12-Pack online Sinclair 608060400541 45 Caliber Nylon Rifle Brushes 12-Pack Buy Sinclair 608060400527 41 Caliber Nylon Rifle Brushes 12 Pack online Sinclair 608060400527 41 Caliber Nylon Rifle Brushes 12 Pack Buy Sinclair 608060400411 270-284 Cal 8-32M Bronze Brushes 12-Pack online Sinclair 608060400411 270-284 Cal 8-32M Bronze Brushes 12-Pack Buy Sinclair 608060400305 20 Caliber Bronze Rifle Brushes 12 Pack online Sinclair 608060400305 20 Caliber Bronze Rifle Brushes 12 Pack Buy Sinclair 608060400251 37 Cal Nylon Rifle Brushes 12-Pack online Sinclair 608060400251 37 Cal Nylon Rifle Brushes 12-Pack Buy Sinclair 608060400244 10mm/40 Cal Nylon Pistol Brushes, 12 Pack online Sinclair 608060400244 10mm/40 Cal Nylon Pistol Brushes, 12 Pack Buy Sinclair 608060400213 338 Caliber Nylon Rifle Brushes 12-Pack online Sinclair 608060400213 338 Caliber Nylon Rifle Brushes 12-Pack Buy Sinclair 608060400206 22 Caliber Nylon Pistol Brushes 12-Pack online Sinclair 608060400206 22 Caliber Nylon Pistol Brushes 12-Pack Buy Sinclair 608060400152 6.5mm 25 Cal Nylon Rifle Brushes 12-Pack online Sinclair 608060400152 6.5mm 25 Cal Nylon Rifle Brushes 12-Pack Buy Sinclair 608060400145 6mm Nylon Rifle Brushes 12-Pack online Sinclair 608060400145 6mm Nylon Rifle Brushes 12-Pack Buy Sinclair 608060400121 22 Caliber Nylon Rifle Brushes 12-Pack online Sinclair 608060400121 22 Caliber Nylon Rifle Brushes 12-Pack Buy BlackPoint Tactical P365XL Holster, Right-Hand Draw, Composite Material, 1.50in Belt Loop, IWB Appendix Carry online BlackPoint Tactical P365XL Holster, Right-Hand Draw, Composite Material, 1.50in Belt Loop, IWB Appendix Carry Buy Sig SAUER P365 Left Hand OWB Holster, Optic Ready, 1.5-1.75in Belt Loop, Composite, Black, Medium online Sig SAUER P365 Left Hand OWB Holster, Optic Ready, 1.5-1.75in Belt Loop, Composite, Black, Medium Buy BlackPoint Tactical P365 OWB Holster - Composite Material, Ideal Concealment, Belt Loop Sizes 1.5in & 1.75in, Left Hand Use online BlackPoint Tactical P365 OWB Holster - Composite Material, Ideal Concealment, Belt Loop Sizes 1.5in & 1.75in, Left Hand Use Buy Sig Sauer P365XL OWB Holster Right Hand Kydex Black 1.5in 1.75in Loop online Sig Sauer P365XL OWB Holster Right Hand Kydex Black 1.5in 1.75in Loop Buy Sig Sauer P365 XL Left Hand IWB Holster Kydex Black Adjustable Ride online Sig Sauer P365 XL Left Hand IWB Holster Kydex Black Adjustable Ride Buy Sig Sauer P365 Handgun Grip 9mm Luger/380 Manual Safety Black Bulk online Sig Sauer P365 Handgun Grip 9mm Luger/380 Manual Safety Black Bulk Buy Sierra 9240 MatchKing .30 Cal .308 210gr HPBT Bullets 500ct online Sierra 9240 MatchKing .30 Cal .308 210gr HPBT Bullets 500ct Buy Sierra MatchKing Rifle Bullets .25 Cal .257 131 gr HPBT/CN 250/ct online Sierra MatchKing Rifle Bullets .25 Cal .257 131 gr HPBT/CN 250/ct Buy Sierra 9377MP MatchKing 22Cal 77gr HPBT Bullets 250/Box online Sierra 9377MP MatchKing 22Cal 77gr HPBT Bullets 250/Box Buy Sierra MatchKing Rifle Bullets .30 cal .308 177 gr HPBT/CN 250/ct online Sierra MatchKing Rifle Bullets .30 cal .308 177 gr HPBT/CN 250/ct Buy Sierra 2269MP MatchKing 30Cal 169gr Hollow Point Boat Tail 250/Box online Sierra 2269MP MatchKing 30Cal 169gr Hollow Point Boat Tail 250/Box Buy Sierra MatchKing Rifle Bullets 6.5mm .264 142 gr HPBT/CN 250/ct online Sierra MatchKing Rifle Bullets 6.5mm .264 142 gr HPBT/CN 250/ct Buy Sierra 1575MP MatchKing 6mm 110gr HPBT 250/Box online Sierra 1575MP MatchKing 6mm 110gr HPBT 250/Box Buy Sierra 1570MP MatchKing 6mm 107gr HPBT 250/Box online Sierra 1570MP MatchKing 6mm 107gr HPBT 250/Box Buy Sierra Bullets 9377G 22 Cal 77gr HPBT Cannelure 500/Box online Sierra Bullets 9377G 22 Cal 77gr HPBT Cannelure 500/Box Buy Sierra Green Tipped GameKing Rifle Bullets .30 cal .308 210 gr TGK 500/ct online Sierra Green Tipped GameKing Rifle Bullets .30 cal .308 210 gr TGK 500/ct Buy Sierra A468106 30-06 Ammo 180GR TGK 20 Rounds 2760 FPS online Sierra A468106 30-06 Ammo 180GR TGK 20 Rounds 2760 FPS Buy Sierra A937709F 223 REM 77GR HP BT Ammo, 20 Rounds, Folds of Honor Edition online Sierra A937709F 223 REM 77GR HP BT Ammo, 20 Rounds, Folds of Honor Edition Buy Sierra A2140-06 .30-06 Sprg 165gr HPBT Rifle Ammo 20 Rounds online Sierra A2140-06 .30-06 Sprg 165gr HPBT Rifle Ammo 20 Rounds Buy Sierra A8460 Outdoor Master 40 S&W 180gr JHP Ammo 20 Rounds online Sierra A8460 Outdoor Master 40 S&W 180gr JHP Ammo 20 Rounds Buy Sierra A8800 Outdoor Master 45 ACP 185GR JHP Ammo 20 Rounds online Sierra A8800 Outdoor Master 45 ACP 185GR JHP Ammo 20 Rounds Buy Sierra A8124--20 Outdoor Master 9mm 124GR JHP Ammo 20RD Box online Sierra A8124--20 Outdoor Master 9mm 124GR JHP Ammo 20RD Box Buy Sierra MatchKing Rifle Bullets .25 Cal .257 131 gr HPBT/CN 500/ct online Sierra MatchKing Rifle Bullets .25 Cal .257 131 gr HPBT/CN 500/ct Buy Sierra 9362 High Velocity GameKing Rifle Bullets .22 Cal 62gr SBT 500ct online Sierra 9362 High Velocity GameKing Rifle Bullets .22 Cal 62gr SBT 500ct Buy Sports Master 9MM (.355") Jacketed Hollow Point Handgun Bullets 8124C online Sports Master 9MM (.355") Jacketed Hollow Point Handgun Bullets 8124C Buy Sierra 7795C 30 Caliber (.308) 195gr Tipped MatchKing Bullets 500/Box online Sierra 7795C 30 Caliber (.308) 195gr Tipped MatchKing Bullets 500/Box Buy Sierra Tipped MatchKing .30 Caliber 175 Grain TMK 500 Rounds online Sierra Tipped MatchKing .30 Caliber 175 Grain TMK 500 Rounds Buy Sierra 7768C Tipped MatchKing .30 Caliber 168 Grain Bullet 500 Count online Sierra 7768C Tipped MatchKing .30 Caliber 168 Grain Bullet 500 Count Buy 30Cal 155Gr TMKMAT Rifle Bullets - 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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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