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300 Blackout (16″ Barrel & 15″ M-Lok Handguard) AR15 Complete Rifle Build Kit #1

$700.00 $550.00 (You Save $150.00)

300 Blackout (16" Barrel & 15" M-Lok Handguard) AR15 Complete Rifle Build Kit #1
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Free Shipping on all orders $325+!

SKU: UA300CM41617(P)-(15)MLOK_Budget


Looking for the simplest, easiest, and most affordable way to build a lightweight, skeletonized AR 15 in 300 Blackout? You’ve found the finishing piece, built and ready: Our complete 16″ 300 Blackout Rifle Upper with skeletonized 15″ M-Lok handguard, BCG and charging handle. This featherweight 300 Blackout Upper offers superior accuracy with tons of real estate for front sights and railed accessories. Some serious aesthetics are a plus with its unique skeletonized handguard.

Mil-Spec Construction

This full-built Upper features a mil-spec Type III Hard Coat Anodized finish with a classic, mil-spec M4 flat top upper receiver. M4 feed ramps ensure reliability and a USGI Picatinny rail provides mounting for any standard optic or rear sight. Forged from 7075 T6 aluminum, this upper’s as tough as any black rifle gets. Inside you’ll find a quality, nitride coated bolt carrier group made of 9130 steel with chrome-lined gas key and charging handle. This kit comes complete with everything needed to build your own 300 Blackout Rifle. 


Gas System: Carbine-length
Barrel Profile: A2
Barrel Steel: Chrome moly vanadium
Barrel Finish: Parkerized
Chrome Lining: No
Muzzle Thread: 5/8×24
Chamber: .300BLK
Twist Rate: 1:7
Barrel Extension: .300BLK
Gas Block Size: .750″
Gas Block Type: Low-profile
Muzzle Device: A2 Flash hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: 15″ free float M-Lok
Bolt Carrier Group Included: Yes
Bolt Steel: 9310 steel, magnetic particle inspected
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes

Benefits of the 16” Carbine-Length Parkerized AR 15 Rifle Kit:

  • 100% legal to own and ship to your front door
  • Not considered a firearm – no FFL paperwork needed!
  • Chrome moly vanadium steel barrel and parts kit ensure sub-MOA accuracy
  • Prebuilt upper with gas system removes the guesswork of rifle making
  • Includes bolt carrier group, free-floated M-Lok handguard and lower parts kit

AR 15 Rifle Kit Details (Expanded):

Barrel: 16″ carbine-length chrome moly vanadium steel, chambered in .300BLK, 1:7 twist rate, .750″ low-profile gas block, 15″ free float M-Lok handguard, with an A2 “birdcage” flash hider.

Upper Receiver Assembly: Forged from 7075 T6 aluminum, hard-coat anodized in black for durability, features M4 feed ramps, and are made in the USA.

Bolt Carrier Group: The bolt carrier is made from 9310 steel and has a staked gas key and black nitride finish. The bolt itself comes complete with an extractor spring and O-ring insert.  It accepts .223, 5.56mm, and .300BLK calibers (though you should NEVER attempt to use a caliber for which your rifle is not chambered), and is magnetic particle inspected.

80% Lower Receiver: Choose to receive a forged or billet Fire/Safe 80% lower receiver.  Our lower receivers are anodized to match the upper receiver perfectly. and they come ready for machining of the trigger pocket and drilling of the safety selector and trigger pin holes.

AR-15 Lower Parts Kit: includes all parts needed to complete the lower receiver including pistol grip, mil-spec safety selector, and trigger/fire control group.

Lower Assembly: comes with complete buffer tube assembly including buffer, buffer spring, six-position buffer tube, latch plate, castle nut, and butt stock based on original Colt design.

Charging Handle: standard size, made from 6061 aluminum.

Please note: This build kit requires that the builder complete the 80% lower receiver themselves, but that’s the rewarding part of the experience (and the only way to build your own AR-15 without the need of an FFL transfer or serialization).

No FFL required Made in the USA Lifetime Warranty

300 Blackout (16″ Barrel & 15″ M-Lok Handguard) AR15 Complete Rifle Build Kit #1

$700.00 $550.00 (You Save $150.00)

In stock

$700.00 $500.00 (You Save $200 )
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