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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.

All uppers and rifles are built to order and have an estimated lead time of 4-6 weeks.
 
$300.00
Features:

- Extremely lightweight profile, button-rifled, chrome moly 5.56 NATO barrel
- 1:7 twist rate, melonite bore and exterior finish
- 1/2-28 TPI RH muzzle threading, 60-degree muzzle crown, and barrel extension installed
- 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


All uppers and rifles are built to order and have an estimated lead time of 4-6 weeks.
 
$70.00
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:

- Durable manganese phosphate coating
- 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
$64.30
Alexander Arms® high-quality gas block manufactured to our specifications

Features:

- Durable manganese phosphate coating
- 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
$64.30
AR-15 replacement firing pin manufactured by Alexander Arms®

Features:

- 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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- 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