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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
2,389
In Stock
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Founded
USA
Origin

All SI Products (2,389)

Buy Sierra 7160 Tipped MatchKing 22 Caliber 60 Grain 100 Count Bullets online Sierra 7160 Tipped MatchKing 22 Caliber 60 Grain 100 Count Bullets Buy Sierra 5400 Sports Master .50 Cal 400gr JSP Handgun Bullets 50ct online Sierra 5400 Sports Master .50 Cal 400gr JSP Handgun Bullets 50ct Buy Sierra 5350 Sports Master .50 Cal 350gr JHP Handgun Bullets 50ct online Sierra 5350 Sports Master .50 Cal 350gr JHP Handgun Bullets 50ct Buy Sierra 4681 Tipped GameKing 30Cal 180gr 100/Box online Sierra 4681 Tipped GameKing 30Cal 180gr 100/Box Buy Sierra 4680 Tipped GameKing 308 Win 180 Grain Boat Tail 100 Count online Sierra 4680 Tipped GameKing 308 Win 180 Grain Boat Tail 100 Count Buy Sierra 4665 Tipped GameKing 308Win 165gr 100/Box Hunting Bullets online Sierra 4665 Tipped GameKing 308Win 165gr 100/Box Hunting Bullets Buy Sierra 4625 Tipped GameKing .30 Caliber 125 Grain 100 Count Bullets online Sierra 4625 Tipped GameKing .30 Caliber 125 Grain 100 Count Bullets Buy Sierra 4580 Green Tipped GameKing 7mm .284 180gr Hunting Bullets 100ct online Sierra 4580 Green Tipped GameKing 7mm .284 180gr Hunting Bullets 100ct Buy Sierra 4565 Tipped GameKing 7mm 165gr HPBT Bullets 100/Box online Sierra 4565 Tipped GameKing 7mm 165gr HPBT Bullets 100/Box Buy Sierra 4550 Tipped GameKing 7mm .284 150 gr - 100 Per Box online Sierra 4550 Tipped GameKing 7mm .284 150 gr - 100 Per Box Buy Sierra Bullets Tipped GameKing 7mm .284 Caliber 140 Gr 100 Rounds online Sierra Bullets Tipped GameKing 7mm .284 Caliber 140 Gr 100 Rounds Buy Sierra Bullets 270 Win 175gr Tipped GameKing Reloading Bullets 100/Box online Sierra Bullets 270 Win 175gr Tipped GameKing Reloading Bullets 100/Box Buy Sierra 4440 Tipped GameKing 270Win 140gr HPBT 100/Box online Sierra 4440 Tipped GameKing 270Win 140gr HPBT 100/Box Buy Sierra 4345 Green Tipped GameKing 6.5mm .264 145gr Rifle Bullets 100ct online Sierra 4345 Green Tipped GameKing 6.5mm .264 145gr Rifle Bullets 100ct Buy Sierra 4340 Tipped GameKing Bullets 6.5mm .264 140gr 100/rd online Sierra 4340 Tipped GameKing Bullets 6.5mm .264 140gr 100/rd Buy Sierra 4330 Tipped GameKing 6.5 Creedmoor 130gr HPBT 100/Box online Sierra 4330 Tipped GameKing 6.5 Creedmoor 130gr HPBT 100/Box Buy Sierra 4320 Green Tipped GameKing 6.5mm .264 120gr TGK Bullets 100ct online Sierra 4320 Green Tipped GameKing 6.5mm .264 120gr TGK Bullets 100ct Buy Sierra Tipped GameKing Rifle Bullets 6mm .243 cal .243" 100 gr BT 100-ct online Sierra Tipped GameKing Rifle Bullets 6mm .243 cal .243" 100 gr BT 100-ct Buy Sierra 4100 Tipped GameKing 6mm .243 90 Grain HPBT 100 Count online Sierra 4100 Tipped GameKing 6mm .243 90 Grain HPBT 100 Count Buy Sierra 4062 Tipped GameKing .22 Cal .224 64 gr 100 Per Box: Optimal thickness, instant expansion, industry-leading BC. online Sierra 4062 Tipped GameKing .22 Cal .224 64 gr 100 Per Box: Optimal thickness, instant expansion, industry-leading BC. Buy Sierra Bullets 3000 375 Cal 300gr Spitzer Boat Tail 50/Box online Sierra Bullets 3000 375 Cal 300gr Spitzer Boat Tail 50/Box Buy Sierra 2950 GameKing 375 Cal .375 250 GR SBT 50 Per Box online Sierra 2950 GameKing 375 Cal .375 250 GR SBT 50 Per Box Buy Sierra Pro-Hunter Rifle Bullets .375 cal .375" 200 gr FN 50-ct online Sierra Pro-Hunter Rifle Bullets .375 cal .375" 200 gr FN 50-ct Buy SIERRA GameKing .35 Caliber (.358) 225Gr SBT 50 Box Bullets (2850) online SIERRA GameKing .35 Caliber (.358) 225Gr SBT 50 Box Bullets (2850) Buy Sierra 2800 Pro-Hunter 35 Cal .358 200 GR RN 50 Per Box online Sierra 2800 Pro-Hunter 35 Cal .358 200 GR RN 50 Per Box Buy Sierra 2755 Pro-Hunter 35Cal 115gr Flat Nose Bullets 100/Box online Sierra 2755 Pro-Hunter 35Cal 115gr Flat Nose Bullets 100/Box Buy Sierra 2650 MatchKing .338 250gr HPBT Bullets 50/Box online Sierra 2650 MatchKing .338 250gr HPBT Bullets 50/Box Buy Sierra 2620 338 Caliber 225gr Spitzer Pointed Bullets 50/Box online Sierra 2620 338 Caliber 225gr Spitzer Pointed Bullets 50/Box Buy Sierra 2610 GameKing .338 Cal 215GR Spitzer Boat Tail 50/Box online Sierra 2610 GameKing .338 Cal 215GR Spitzer Boat Tail 50/Box Buy Sierra 2600 GameKing 338 Cal .338 250 GR SBT 50 Per Box online Sierra 2600 GameKing 338 Cal .338 250 GR SBT 50 Per Box Buy Sierra 2420 8mm 220gr Spitzer Boat Tail Bullets 50/Box online Sierra 2420 8mm 220gr Spitzer Boat Tail Bullets 50/Box Buy Sierra Bullets 2415 8mm 200gr HPBT Rifle Bullets 100/Box online Sierra Bullets 2415 8mm 200gr HPBT Rifle Bullets 100/Box Buy SIERRA Pro-Hunter 8mm (.323) 175Gr Spitzer 100 Box Bullets (2410) online SIERRA Pro-Hunter 8mm (.323) 175Gr Spitzer 100 Box Bullets (2410) Buy Sierra 2400 Pro-Hunter 8mm 150gr Spitzer Bullets 100/Box online Sierra 2400 Pro-Hunter 8mm 150gr Spitzer Bullets 100/Box Buy Sierra 2315 MatchKing .311 174gr HPBT Rifle Bullets 100/Box online Sierra 2315 MatchKing .311 174gr HPBT Rifle Bullets 100/Box Buy Sierra Pro-Hunter Rifle Bullets .303 cal-7mm .311" 180 gr SPT 100-ct online Sierra Pro-Hunter Rifle Bullets .303 cal-7mm .311" 180 gr SPT 100-ct Buy Sierra 2305 Pro-Hunter 303 Cal 125gr Spitzer Bullets 100/Box online Sierra 2305 Pro-Hunter 303 Cal 125gr Spitzer Bullets 100/Box Buy Sierra 2300 Pro-Hunter .311 Cal 150gr Spitzer Bullets 100ct Box online Sierra 2300 Pro-Hunter .311 Cal 150gr Spitzer Bullets 100ct Box Buy Sierra 2275 MatchKing .308 175gr HPBT Match Grade online Sierra 2275 MatchKing .308 175gr HPBT Match Grade Buy Sierra Bullets HPBT-CN Matchking 30 Cal .308 169 Gr 100/rd Boattail online Sierra Bullets HPBT-CN Matchking 30 Cal .308 169 Gr 100/rd Boattail Buy Sierra MatchKing .30 cal / 7.62mm .308 230gr HPBT MatchKing Bullets 50/ct - Accurate, Long Range Performance online Sierra MatchKing .30 cal / 7.62mm .308 230gr HPBT MatchKing Bullets 50/ct - Accurate, Long Range Performance Buy Sierra 2240 .308 220gr HPBT Match Grade Reloading Bullets online Sierra 2240 .308 220gr HPBT Match Grade Reloading Bullets Buy Sierra GameKing Rifle Bullets .30 cal .308 205 gr HPBT/CN 100/ct online Sierra GameKing Rifle Bullets .30 cal .308 205 gr HPBT/CN 100/ct Buy Sierra 2232 MatchKing-X 30Cal 200gr HPBT 100/Box online Sierra 2232 MatchKing-X 30Cal 200gr HPBT 100/Box Buy Sierra Bullets 2231 30 Cal 200gr MatchKing HPBT 100-Box online Sierra Bullets 2231 30 Cal 200gr MatchKing HPBT 100-Box Buy Sierra 2230 MatchKing .308 200gr HPBT Bullets 100/Box online Sierra 2230 MatchKing .308 200gr HPBT Bullets 100/Box Buy Sierra 2210 MatchKing 30Cal 190gr HPBT Bullets 100/Box online Sierra 2210 MatchKing 30Cal 190gr HPBT Bullets 100/Box Buy Sierra 2200 MatchKing 30 Cal .308 168 gr HPBT 100 Per Box online Sierra 2200 MatchKing 30 Cal .308 168 gr HPBT 100 Per Box

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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