DIY Parts & Components

5.56 NATO | DIY Parts & Components
Introducing the Alexander Arms 5.56 NATO Upper Kit! This kit has everything you need to get started on your very own 5.56 upper build! The kit includes:
  • -Mil-Spec flat top upper receiver (port door and forward assist installed)
  • -Our very own high quality 16" chrome moly, extreme lightweight barrel with a 1:7 twist and a melonite finish, threaded 1/2-28 TPI RH
  • -Your choice of either a Low Profile or Picatinny Railed Gas Block
  • -Mid-length Gas tube
  • -Mil-Spec charging handle
The kit does not include a bolt, bolt carrier, barrel nut, or handguard.
$300.00
This product is being introduced for individual sale while supplies last! Extremely lightweight profile, button-rifled, chrome moly 5.56 NATO barrel. Features 1:7 twist rate, melonite bore and exterior finish, 1/2-28 TPI RH muzzle threading, 60-degree muzzle crown, and barrel extension installed. Manufactured by Alexander Arms® and sold with exactly the same specifications as the Alexander Arms® 5.56 Incursion upper receiver assembly. Fully-inspected and fully-prepared for assembly into an AR-15 platform rifle. Barrel weight is 1.52 pounds. Gas block diameter is 0.750 inches. Specifications are not optional and custom barrels are not made. Please review the warranty disclaimer in the Additional Info section before ordering. We are sorry, but we do not sell 5.56 NATO bolts as these are standard-specification and widely available throughout the firearms industry.
$115.00
Alexander Arms® high-quality gas tubes manufactured to our specifications. Available in carbine-, mid-, and rifle-length sizes. Mates perfectly with the gas blocks and barrels currently being sold by Alexander Arms®. Does not include a gas tube roll pin or any other supplies.
Alexander Arms® high-quality gas block manufactured to our specifications. Features a durable manganese phosphate coating and set screw attachment. Weight of gas block is 0.13 pounds. Mates perfectly with the Lite series barrels and gas tubes currently being sold by Alexander Arms®. Two set screws are required and included.
$93.50
Alexander Arms® high-quality gas block manufactured to our specifications. Features a durable manganese phosphate coating and set screw attachment. Weight of gas block is 0.23 pounds. Mates perfectly with the Lite series barrels and gas tubes currently being sold by Alexander Arms®. Two set screws are required and included.
$93.50
AR-15 replacement firing pin manufactured by Alexander Arms®. AISI 8740 alloy steel in austempered spring condition. Precision machined with correct transition radii to eliminate breakage. Thin, dense chrome coating minimizes hydrogen embrittlement. Trilobial main shank maintains alignment of the cam pin. Provides reduced contact surface that produces easy sliding of the firing pin within the channel. Provides clearance for dirt and carbon that results in more reliable function. Proven to operate at -65 Celsius in correctly lubricated weapons. Fluting is not cut all the way to the back of the firing pin, which keeps debris from entering the channel from the rear.
$15.95
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Alexander Arms® advanced G10 composite handguard system gives heat, cold, and chemical resistance while providing featherweight rigidity and an excellent tactical surface. Upper vents assist in rapid cooling of barrels and are spaced to reduce mirage. Low-profile, 2-inch diameter, free-floated, and includes a 7075 aluminum barrel nut. This item has corrosion-resistant, threaded inserts spaced to attach our 3-inch Picatinny rail sections per user requirements. Attaches to threaded inserts via Allen head screws. Overall length is approximately 12.5 inches. Weight including barrel nut is 0.81 pounds; barrel nut weight is 0.16 pounds. The handguard is compatible with any and all standard AR-15 upper receivers and is not suitable for piston-driven systems with components that run under the handguard or weapons using alternative methods of handguard attachment. You may view the introduction and installation instructions for this item here on our web site.
$175.00
Alexander Arms® AR-15 billet upper receiver kit. Beefy, squared upper resists flexing with usage of long barrels. This product includes only an upper receiver, a chromed carrier with gas key installed, and a side-charging handle. This upper receiver is designed for use with the 6.5 Grendel cartridge, but is also 5.56/.223 compatible. It may be compatible with other cartridges, but this is not tested or guaranteed. The upper receiver does not feature extended feed ramps. This product is not for use with .50 Beowulf® or similarly large cartridges. Because of very limited available supplies, production lead times for this product may be uncontrollably long.
$357.67
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Vltor SASE Sling Mount End Plate, HK style hook. The SASE sling end plate is an ambidextrous sling plate made to suit the demands of both right- and left-handed operators. These sling plates are a direct replacement to your existing receiver end plate.
$19.95
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