7.5" 5.56 NATO AR-15 SBR-Ready Kit – Compression Series, Color Choice

5.56 Pistol Kit: Specs & What's Included

The Moriarti Compression Series 7.5" 5.56 NATO SBR-Ready Kit is an AR-15 component package featuring a 7.5" barrel, 7" M-LOK handguard, and mil-spec six-position receiver extension with coordinated anodized color options.

The barrel is manufactured from 4150 steel and features a 1:7 twist. It is equipped with a 1/2×28 threaded A2 flash hider, nitride-coated for corrosion resistance, and a crush washer.

The configuration includes a pistol-length gas system, .750 low-profile steel gas block, forged AR-15 upper receiver, M16-profile nitride bolt carrier group, charging handle, lower parts kit, and receiver extension components.

Available in 11 anodized color choices: Black, Blue, Bronze, Grey, Green, FDE, Pink, Red, Purple, Gold, and Clear.

Lower receiver and magazine are not included.

Key Features

• 7.5" 5.56 NATO Barrel: 4150 steel with 1:7 twist.

• A2 Flash Hider: Nitride-coated, with 1/2×28 threads and crush washer.

• Pistol-Length Gas System: With .750 low-profile steel gas block.

• 7" M-LOK Handguard: Aluminum handguard configuration.

• Forged AR-15 Upper Receiver: Included.

• M16-Profile Nitride BCG: Included.

• Mil-Spec Six-Position Receiver Extension: Color-matched anodized finish.

• Charging Handle and Lower Parts Kit: Included.

• 11 Color Options: Black, Blue, Bronze, Grey, Green, FDE, Pink, Red, Purple, Gold, and Clear.

Specifications

Package Includes

• 7.5" 5.56 NATO upper assembly components

• 4150 steel barrel with 1:7 twist

• Forged AR-15 upper receiver

• 7" M-LOK handguard

• Pistol-length gas system components

• .750 low-profile steel gas block

• Nitride-coated A2 flash hider with crush washer

• M16-profile nitride bolt carrier group

• Charging handle

• Lower parts kit

• Mil-spec six-position receiver extension and associated components

Does not include lower receiver or magazine.

Frequently Asked Questions

What caliber is this kit chambered in?

The kit is chambered in 5.56 NATO and is compatible with .223 Remington ammunition.

What barrel specifications does it feature?

A 7.5" 4150 steel barrel with a 1:7 twist.

What muzzle device is included?

A nitride-coated A2 flash hider with 1/2×28 threading and a crush washer.

What gas system does this kit use?

A pistol-length gas system with a .750 low-profile steel gas block.

What bolt carrier group is included?

An M16-profile nitride bolt carrier group.

What receiver extension is included?

A mil-spec six-position receiver extension with a coordinated anodized finish.

Are the lower receiver and magazine included?

No. Neither component is included.

Is the kit itself a registered SBR?

No. The kit does not include a lower receiver. The legal classification of a completed firearm depends on its configuration and applicable laws.

Product Image Notice

Images may not be the exact representation of the product.

FAQ

Is a lower receiver included?

No. The lower receiver is sold separately; you finish the build on your own AR-15 lower.

What bolt and magazines does it use?

A standard 5.56 AR-15 bolt carrier group and standard AR-15 / STANAG magazines.

Can I put a stock on this pistol kit?

Adding a shoulder stock to a build with a barrel under 16" makes it a short-barreled rifle under the NFA. Do it only in compliance with federal and state rules.

Related: 5.56 NATO build kits · all AR-15 build kits