Showing 337–384 of 549 results

  • -14%
    MSF 10” 9mm Pistol Upper Assembly
    MSF 10” 9mm Pistol Upper Assembly
    Style: Pistol
    Caliber: 9mm
    Original price was: $349.00.Current price is: $299.00. View Product
  • -9%
    MSF 11.5” 5.56/.223 Pistol Build Kit
    MSF 11.5” 5.56/.223 Pistol Build Kit
    Style: Pistol
    Barrel Size: 11.5"
    Original price was: $549.00.Current price is: $499.00. View Product
  • -14%
    MSF 11.5” 5.56/.223 Pistol Upper Assembly
    MSF 11.5” 5.56/.223 Pistol Upper Assembly
    Barrel Size: 11.5"
    Caliber: 5.56/.223
    Original price was: $349.00.Current price is: $299.00. View Product
  • -9%
    MSF 12.5” 5.56/.223 Pistol Build Kit
    MSF 12.5” 5.56/.223 Pistol Build Kit
    Caliber: 5.56/.223
    Style: Pistol
    Rated 5.00 out of 5 based on 1 customer rating
    (1)
    Original price was: $549.00.Current price is: $499.00. View Product
  • -14%
    MSF 12.5” Pistol 5.56/.223 Ar15 Upper Assembly
    MSF 12.5” Pistol 5.56/.223 Ar15 Upper Assembly
    Barrel Size: 12.5"
    Style: Pistol
    Rated 4.75 out of 5 based on 8 customer ratings
    (8)
    Original price was: $349.00.Current price is: $299.00. View Product
  • -14%
    MSF 12.5” Pistol 5.56/.223 Ar15 Upper Assembly 1:7 mid length
    MSF 12.5” Pistol 5.56/.223 Ar15 Upper Assembly 1:7 mid length
    Barrel Size: 12.5"
    Caliber: 5.56/.223
    Original price was: $349.00.Current price is: $299.00. View Product
  • -9%
    MSF 14.5” 5.56/.223 Pistol Build Kit
    MSF 14.5” 5.56/.223 Pistol Build Kit
    Barrel Size: 14.5"
    Caliber: 5.56/.223
    Original price was: $549.00.Current price is: $499.00. View Product
  • -14%
    MSF 13.9” 5.56/.223 Ar15 Pistol Upper Assembly
    MSF 13.9” 5.56/.223 Ar15 Pistol Upper Assembly
    Barrel Size: 14.5"
    Caliber: 5.56/.223
    Original price was: $349.00.Current price is: $299.00. View Product
  • -14%
    MSF 14.5” 5.56/.223 Pistol Upper Assembly
    MSF 14.5” 5.56/.223 Pistol Upper Assembly
    Style: Pistol
    Caliber: 5.56/.223
    Rated 5.00 out of 5 based on 3 customer ratings
    (3)
    Original price was: $349.00.Current price is: $299.00. View Product
  • -8%
    MSF 14.5” Pin/weld 5.56/.223 Rifle Build Kit
    MSF 14.5” Pin/weld 5.56/.223 Rifle Build Kit
    Style: Rifle
    Caliber: 5.56/.223
    Rated 4.00 out of 5 based on 1 customer rating
    (1)
    Original price was: $599.00.Current price is: $549.00. View Product
  • -24%
    MSF 13.9” Pin/weld 5.56/.223 Ar15 Rifle Upper assembly
    MSF 13.9” Pin/weld 5.56/.223 Ar15 Rifle Upper assembly
    Barrel Size: 13.9"
    Style: Rifle
    Rated 4.64 out of 5 based on 14 customer ratings
    (14)
    Original price was: $499.00.Current price is: $379.00. View Product
  • -43%
    MSF 13.9” Pin/weld 5.56/.223 Ar15 Rifle Upper assembly with long ASR mount
    MSF 13.9” Pin/weld 5.56/.223 Ar15 Rifle Upper assembly with long ASR mount
    Style: Rifle
    Barrel Size: 13.9"
    Original price was: $879.00.Current price is: $499.00. View Product
  • -24%
    MSF 13.9” Pin/weld 223 Wylde 1:7 Ar15 Rifle Upper assembly
    MSF 13.9” Pin/weld 223 Wylde 1:7 Ar15 Rifle Upper assembly
    Style: Rifle
    Barrel Size: 13.9"
    Original price was: $499.00.Current price is: $379.00. View Product
  • -24%
    MSF 14.5” Pin/weld 5.56/.223 Ar15 Rifle Upper assembly
    MSF 14.5” Pin/weld 5.56/.223 Ar15 Rifle Upper assembly
    Barrel Size: 14.5"
    Style: Rifle
    Rated 4.60 out of 5 based on 10 customer ratings
    (10)
    Original price was: $499.00.Current price is: $379.00. View Product
  • -16%
    MSF 16' 5.56 Nato 1/7 4150cmv Black Nitride barrel
    MSF 16″ 5.56 Nato 1/7 4150cmv Black Nitride barrel
    Caliber: 5.56/.223
    Barrel Size: 16"
    Original price was: $165.00.Current price is: $139.00. View Product
  • -13%
    MSF 16” 6.5 Grendel Rifle Build Kit
    MSF 16” 6.5 Grendel Rifle Build Kit
    Caliber: 6.5 Grendel
    Barrel Size: 16"
    Original price was: $599.00.Current price is: $524.00. View Product
  • -13%
    MSF 16” 6.5 Grendel Upper Receiver Assembly
    MSF 16” 6.5 Grendel Upper Receiver Assembly
    Barrel Size: 16"
    Caliber: 6.5 Grendel
    Original price was: $374.00.Current price is: $324.00. View Product
  • -8%
    MSF 16” .350 Legend Rifle Build Kit
    MSF 16” .350 Legend Rifle Build Kit
    Caliber: .350 Legend
    Style: Rifle
    Original price was: $599.00.Current price is: $549.00. View Product
  • -13%
    MSF 16” .350 Legend Upper Receiver Assembly
    MSF 16” .350 Legend Upper Receiver Assembly
    Style: Rifle
    Barrel Size: 16"
    Rated 5.00 out of 5 based on 2 customer ratings
    (2)
    Original price was: $399.00.Current price is: $349.00. View Product
  • -8%
    MSF 16” .450 Bushmaster Rifle Build Kit
    MSF 16” .450 Bushmaster Rifle Build Kit
    Barrel Size: 16"
    Caliber: .450 Bushmaster
    Original price was: $599.00.Current price is: $549.00. View Product
  • -13%
    MSF 16” .450 Bushmaster Upper Receiver Assembly
    MSF 16” .450 Bushmaster Upper Receiver Assembly
    Caliber: .450 Bushmaster
    Barrel Size: 16"
    Original price was: $399.00.Current price is: $349.00. View Product
  • -8%
    MSF 16” .458 Socom Rifle Build Kit
    MSF 16” .458 Socom Rifle Build Kit
    Caliber: .458 Socom
    Barrel Size: 16"
    Original price was: $599.00.Current price is: $549.00. View Product
  • -13%
    MSF 16” .458 Socom Upper Receiver Assembly
    MSF 16” .458 Socom Upper Receiver Assembly
    Caliber: .458 Socom
    Style: Rifle
    Rated 5.00 out of 5 based on 2 customer ratings
    (2)
    Original price was: $399.00.Current price is: $349.00. View Product
  • -14%
    MSF 16” (Pistol Gas) 300 Blackout Upper Assembly
    MSF 16” (Pistol Gas) 300 Blackout Upper Assembly
    Style: Rifle
    Caliber: 300 BLK
    Rated 5.00 out of 5 based on 2 customer ratings
    (2)
    Original price was: $349.00.Current price is: $299.00. View Product
  • -27%
    MSF 16” 300 Blackout Ar-15 Rifle Build Kit
    MSF 16” 300 Blackout Ar-15 Rifle Build Kit
    Style: Rifle
    Barrel Size: 16"
    Original price was: $549.00.Current price is: $399.00. View Product
  • -27%
    MSF 16” 5.56/.223 Rifle Kit
    MSF 16” 5.56/.223 Rifle Kit
    Barrel Size: 16"
    Caliber: 5.56/.223
    Rated 4.86 out of 5 based on 14 customer ratings
    (14)
    Original price was: $549.00.Current price is: $399.00. View Product
  • -14%
    MSF 16” 5.56/.223 Upper Assembly
    MSF 16” 5.56/.223 Upper Assembly
    Caliber: 5.56/.223
    Style: Rifle
    Rated 4.38 out of 5 based on 8 customer ratings
    (8)
    Original price was: $349.00.Current price is: $299.00. View Product
  • -9%
    MSF 16” 9mm Rifle Build Kit
    MSF 16” 9mm Rifle Build Kit
    Style: Rifle
    Barrel Size: 16"
    Original price was: $549.00.Current price is: $499.00. View Product
  • -14%
    MSF 16” 9mm Upper Assembly
    MSF 16” 9mm Upper Assembly
    Style: Rifle
    Barrel Size: 16"
    Original price was: $349.00.Current price is: $299.00. View Product
  • -9%
    MSF 16″ 7.62x39mm Rifle Build Kit
    MSF 16″ 7.62x39mm Rifle Build Kit
    Barrel Size: 16"
    Caliber: 7.62x39
    Original price was: $574.00.Current price is: $524.00. View Product
  • -13%
    MSF 16″ 7.62x39mm Upper Receiver Assembly
    MSF 16″ 7.62x39mm Upper Receiver Assembly
    Style: Rifle
    Barrel Size: 16"
    Rated 5.00 out of 5 based on 2 customer ratings
    (2)
    Original price was: $374.00.Current price is: $324.00. View Product
  • -8%
    MSF 18” .450 Bushmaster Rifle Build Kit
    MSF 18” .450 Bushmaster Rifle Build Kit
    Barrel Size: 18"
    Style: Rifle
    Rated 5.00 out of 5 based on 3 customer ratings
    (3)
    Original price was: $639.00.Current price is: $589.00. View Product
  • -11%
    MSF 18” .450 Bushmaster Upper Receiver Assembly
    MSF 18” .450 Bushmaster Upper Receiver Assembly
    Caliber: .450 Bushmaster
    Barrel Size: 18"
    Rated 5.00 out of 5 based on 1 customer rating
    (1)
    Original price was: $439.00.Current price is: $389.00. View Product
  • -9%
    MSF 18” 5.56/.223 Rifle Build Kit
    MSF 18” 5.56/.223 Rifle Build Kit
    Caliber: 5.56/.223
    Style: Rifle
    Rated 5.00 out of 5 based on 2 customer ratings
    (2)
    Original price was: $549.00.Current price is: $499.00. View Product
  • -8%
    MSF 18” 5.56/.223 Upper Receiver Assembly
    MSF 18” 5.56/.223 Upper Receiver Assembly
    Barrel Size: 18"
    Style: Rifle
    Original price was: $379.00.Current price is: $349.00. View Product
  • -3%
    MSF 18” 6.5 Grendel Rifle Build Kit
    MSF 18” 6.5 Grendel Rifle Build Kit
    Barrel Size: 18"
    Caliber: 6.5 Grendel
    Original price was: $599.00.Current price is: $579.00. View Product
  • -12%
    MSF 18” 6.5 Grendel Upper Receiver Assembly
    MSF 18” 6.5 Grendel Upper Receiver Assembly
    Barrel Size: 18"
    Style: Rifle
    Original price was: $429.00.Current price is: $379.00. View Product
  • -33%
    MSF 20” 5.56/.223 Wylde Ar15 Upper Assembly with 15' gen3 MLok - blem
    MSF 20” 5.56/.223 Wylde Ar15 Upper Assembly with 15″ gen3 MLok – blem
    Caliber: 5.56/.223
    Barrel Size: 20"
    Rated 5.00 out of 5 based on 12 customer ratings
    (12)
    Original price was: $449.00.Current price is: $299.00. View Product
  • -13%
    MSF 20” SS Fluted (Rifle Gas) 5.56/.223 Ar15 Upper Assembly
    MSF 20” SS Fluted (Rifle Gas) 5.56/.223 Ar15 Upper Assembly
    Caliber: 5.56/.223
    Style: Rifle
    Rated 5.00 out of 5 based on 4 customer ratings
    (4)
    Original price was: $449.00.Current price is: $389.00. View Product
  • MSF 20” 5.56/.223 Rifle Build Kit
    MSF 20” 5.56/.223 Rifle Build Kit
    Barrel Size: 20"
    Caliber: 5.56/.223
    $549.00 View Product
  • -27%
    MSF 3” 9mm Pistol Build Kit
    MSF 3” 9mm Pistol Build Kit
    Caliber: 9mm
    Barrel Size: 3"
    Original price was: $549.00.Current price is: $399.00. View Product
  • -14%
    MSF 3” 9mm Pistol Upper Assembly
    MSF 3” 9mm Pistol Upper Assembly
    Caliber: 9mm
    Style: Pistol
    Original price was: $349.00.Current price is: $299.00. View Product
  • -9%
    MSF 5” 9mm Pistol Build Kit
    MSF 5” 9mm Pistol Build Kit
    Barrel Size: 5"
    Caliber: 9mm
    Original price was: $549.00.Current price is: $499.00. View Product
  • -43%
    Blem 5” 9mm Ar15 Ar9 Pistol Upper Assembly
    Blem 5” 9mm Ar15 Ar9 Pistol Upper Assembly
    Caliber: 9mm
    Barrel Size: 5"
    Original price was: $349.00.Current price is: $199.00. View Product
  • -9%
    MSF 7.5' 7.62x39mm Pistol Build Kit
    MSF 7.5″ 7.62x39mm Pistol Build Kit
    Barrel Size: 7.5"
    Style: Pistol
    Original price was: $574.00.Current price is: $524.00. View Product
  • -13%
    MSF 7.5' Pistol 7.62x39mm Upper Assembly
    MSF 7.5″ Pistol 7.62x39mm Upper Assembly
    Caliber: 7.62x39
    Barrel Size: 7.5"
    Original price was: $374.00.Current price is: $324.00. View Product
  • -9%
    MSF 7.5” 300 Blackout Pistol Build Kit
    MSF 7.5” 300 Blackout Pistol Build Kit
    Caliber: 300 BLK
    Style: Pistol
    Original price was: $549.00.Current price is: $499.00. View Product
  • -9%
    MSF 7.5” 5.56/.223 Pistol Build Kit
    MSF 7.5” 5.56/.223 Pistol Build Kit
    Caliber: 5.56/.223
    Barrel Size: 7.5"
    Original price was: $549.00.Current price is: $499.00. View Product

Showing 337–384 of 549 results

Choosing AR15 and AR10 Parts 

AR15 parts on this page range from receivers and barrels to handguards, bolt carrier groups, charging handles, and smaller components. Some are sold separately. Others come in kits or assemblies.

AR 10 parts are listed in the same category. With large-frame products, fit can depend on the exact pattern or receiver. The specifications on the product page are more useful than the general part name alone.

Types of AR Parts Available 

Main groups of AR 15 parts and accessories include:

  • Lower receivers and lower components
  • Upper receivers and upper components
  • Barrels and handguards
  • Bolt carrier groups and charging handles
  • Gas-system and muzzle components
  • Parts kits and assemblies

Products in one group are not always alike. Barrels can differ by caliber, length, or profile. Kit contents also vary, even when two listings have similar names.

What to Check Before Ordering 

For AR-15 parts, compare the details that apply to the specific component:

  • Platform listed for the product
  • Receiver, pattern, or manufacturer notes
  • Caliber, length, or size where relevant
  • Parts included with a kit or assembly

Similar product names do not always mean identical specifications. The same applies to AR parts that look similar in the category grid.

AR15 and AR10 Compatibility

AR15 and large-frame products often use the same names for components. The name itself does not confirm the same fit or dimensions.

Large-frame parts can also differ by pattern or manufacturer. For AR10 parts, check any pattern, receiver, or platform information given in the listing before comparing products.

Frequently Asked Questions 

They can, but the brand name alone does not confirm compatibility. Some products use proprietary dimensions or designs. Check the fit notes for the parts being compared.

OEM refers to parts supplied by or for the original manufacturer. Aftermarket parts come from other manufacturers. Material, finish, dimensions, and configuration can vary in either group.

Individual parts suit cases where one specific component is needed. A kit places several components in one package. Contents differ between products, so compare the included parts before choosing a kit.