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Primary Weapons

Primary Weapons is a leading manufacturer of high-performance firearms and accessories, headquartered in Boise, Idaho, and recognized for its commitment to innovation, quality, and reliability in both tactical and sporting applications. The company’s vertically integrated production—utilizing advanced CNC machining and in-house manufacturing for over 90% of components—ensures exceptional craftsmanship and consistency across its product lines. Primary Weapons is best known for its rifles, including the MK1 and MK2 series, which combine the durability of a long-stroke piston system with the accuracy of the AR platform, offering shooters a low-maintenance, dependable option for demanding environments. In addition to complete rifles, Primary Weapons offers lower receivers, rifle accessories, and precision barrels, all designed to meet the needs of sportsmen, law enforcement, and military users. Featured calibers include .223 / 5.56 and 5.56x45, with each firearm engineered for real-world performance and tested under rigorous conditions. Browse the full selection of Primary Weapons products to find the right solution for your shooting needs.

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1-24 of 38 Products
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Primary Weapons Systems 4BTRLPB-1F Castle Nut Ratchet Lock

Primary Weapons Systems 4BTRLPB-1F Castle Nut Ratchet Lock

$39 95
In Stock
Primary Weapons 3G2FSC12A1 FSC Mod 2 .223 4140 Steel 2.33" X .865"

Primary Weapons 3G2FSC12A1 FSC Mod 2 .223 4140 Steel 2.33" X .865"

$84 96
In Stock
Primary Weapons Systems MK116 MOD 1-M 223 Wylde 16.1" Upper Receiver - MK1-M1U-223-16

Primary Weapons Systems MK116 MOD 1-M 223 Wylde 16.1" Upper Receiver - MK1-M1U-223-16

$1029 49
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Primary Weapons Systems UXR Conversion Kit, .223 Wylde, 16" Barrel - UXR-CK-223-16

Primary Weapons Systems UXR Conversion Kit, .223 Wylde, 16" Barrel - UXR-CK-223-16

$499 95
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Primary Weapons 4G2BTPB-1F Castle Nut 7075 T-6 Aluminum Black Anodized

Primary Weapons 4G2BTPB-1F Castle Nut 7075 T-6 Aluminum Black Anodized

$99 95
In Stock
PWS 3FRC12A-1F FRC Comp Flat 2PORT 223 1/2X28

PWS 3FRC12A-1F FRC Comp Flat 2PORT 223 1/2X28

$84 95
In Stock
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Primary Weapons U2E14YA011F UXR Conversion Kit Black 223 Wylde Black 14.50" Barrel

Primary Weapons U2E14YA011F UXR Conversion Kit Black 223 Wylde Black 14.50" Barrel

$499 95
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Primary Weapons UCRW0004011F UXR Magwell Assembly 223Wylde/300Blackout Fits AR-15 Black

Primary Weapons UCRW0004011F UXR Magwell Assembly 223Wylde/300Blackout Fits AR-15 Black

$113 19
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PWS U2E14RB11-1F UXR Elite Rifle 300 Blackout 14.5

PWS U2E14RB11-1F UXR Elite Rifle 300 Blackout 14.5

$2499 95
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PWS U2E16RA11-1F UXR Elite Rifle 223WYL 16"

PWS U2E16RA11-1F UXR Elite Rifle 223WYL 16"

$2499 95
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PWS U2E14RA11-1F UXR Elite Rifle 223WYL 14.5

PWS U2E14RA11-1F UXR Elite Rifle 223WYL 14.5

$2499 95
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PWS U2E16RC11-1F UXR Elite Rifle 308 16"

PWS U2E16RC11-1F UXR Elite Rifle 308 16"

Out of Stock
Primary Weapons 3CQB12A1 CBQ 223 Rifle .223 4140 Steel 2.57" L

Primary Weapons 3CQB12A1 CBQ 223 Rifle .223 4140 Steel 2.57" L

Out of Stock
Primary Weapons MK1-M1U-223-11 MK1 Mod 1-M Upper 223 Wylde 11.85" Black Anodized Barrel for AR-15

Primary Weapons MK1-M1U-223-11 MK1 Mod 1-M Upper 223 Wylde 11.85" Black Anodized Barrel for AR-15

Out of Stock
Primary Weapons FRC-T-2P-1/2X28 FRC 2-Port Compensator Black 1/2"x28 Threads 1.80" OAL 223 Rem

Primary Weapons FRC-T-2P-1/2X28 FRC 2-Port Compensator Black 1/2"x28 Threads 1.80" OAL 223 Rem

Out of Stock
Primary Weapons 3PRC58C1 PRC 5/8x24 .338 LM 4140 Steel 3"

Primary Weapons 3PRC58C1 PRC 5/8x24 .338 LM 4140 Steel 3"

Out of Stock
Primary Weapons 3JTC14F1 J-TAC 47 .30 Cal 4140 Steel 1.95" X .875"

Primary Weapons 3JTC14F1 J-TAC 47 .30 Cal 4140 Steel 1.95" X .875"

Out of Stock
Primary Weapons 3FRC58C-1F FRC 2-Port Compensator Flat Black

Primary Weapons 3FRC58C-1F FRC 2-Port Compensator Flat Black

Out of Stock
Primary Weapons 5PWSCB30-1F Body Buffer H2 4140 Steel Black

Primary Weapons 5PWSCB30-1F Body Buffer H2 4140 Steel Black

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Primary Weapons 5PWCBH3-1F Body Buffer H3 4140 Steel Black

Primary Weapons 5PWCBH3-1F Body Buffer H3 4140 Steel Black

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Primary Weapons 5PWCBH2-1F Body Buffer H2 4140 Steel Black

Primary Weapons 5PWCBH2-1F Body Buffer H2 4140 Steel Black
Out of Stock
Primary Weapons 22-2M116RA1B MK116 MOD 2 223WYLDE 16.1 FSC556

Primary Weapons 22-2M116RA1B MK116 MOD 2 223WYLDE 16.1 FSC556

Out of Stock
Primary Weapons 22-2M100SM1B MK1 Mod 2-M Black Anodized Stripped Lower for AR-15, Oversized Ambi Bolt Release/Catch

Primary Weapons 22-2M100SM1B MK1 Mod 2-M Black Anodized Stripped Lower for AR-15, Oversized Ambi Bolt Release/Catch

Out of Stock
Primary Weapons 2M100RM11-1F MK1 MOD 2-M Lower 7075-T6 Aluminum Black Anodized

Primary Weapons 2M100RM11-1F MK1 MOD 2-M Lower 7075-T6 Aluminum Black Anodized

Out of Stock
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