5" 5.56 NATO AR-15 Compression Series SBR-Ready Kit – Color Choice

5.56 Pistol Kit: Specs & What's Included

The Moriarti Compression Series 5" 5.56 NATO SBR-Ready Kit is a multi-component AR-15 kit featuring a compact 5" barrel configuration, a 4" M-LOK handguard, and a color-matched mil-spec six-position receiver extension.

Features a mil-spec six-position receiver extension with a color-matched anodized finish, available in 11 color options.

The kit includes an upper receiver assembly, M16-profile nitride bolt carrier group, charging handle, lower parts kit, and receiver extension components. The lower receiver is not included.

The SBR-Ready designation describes the kit's intended configuration; it does not indicate that the components constitute a registered short-barreled rifle.

Key Features

• 5" Barrel: 4150 steel barrel chambered in 5.56 NATO.

• Micro-Length Gas System: Compact gas system with a .750 low-profile steel gas block.

• 4" M-LOK Handguard: Compact handguard configuration.

• Mil-Spec Six-Position Receiver Extension: Anodized finish coordinated with the selected color.

• M16-Profile Bolt Carrier Group: Nitride-finished BCG included.

• Charging Handle: Included.

• Lower Parts Kit: Included.

• A2 Flash Hider: Included muzzle device.

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

• Lower Receiver: Not included.

Specifications

Specification	Details
Manufacturer	Moriarti Armaments
Series	Compression Series
Product Type	SBR-Ready Component Kit
Platform	AR-15
Caliber	5.56 NATO / .223 Remington
Barrel Length	5"
Barrel Material	4150 Steel
Gas System	Micro-Length
Gas Block	.750 Low-Profile Steel
Handguard	4" M-LOK
Bolt Carrier Group	M16-Profile Nitride
Charging Handle	Included
Muzzle Device	A2 Flash Hider
Receiver Extension	Mil-Spec Six-Position
Receiver Extension Finish	Color-Matched Anodized
Color Options	Black, Blue, Bronze, Grey, Green, FDE, Pink, Red, Purple, Gold, Clear
Lower Parts Kit	Included
Lower Receiver	Not Included
Assembly Option	Unassembled Kit / Assembled Upper Option

Package Includes

• 5" 5.56 NATO upper assembly components

• 4" M-LOK handguard

• Micro-length gas system components

• .750 low-profile steel gas block

• A2 flash hider

• M16-profile nitride bolt carrier group

• Charging handle

• Lower parts kit

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

Does not include lower receiver.

Frequently Asked Questions

What makes this kit SBR-ready?

The SBR-Ready designation identifies the kit's compact barrel configuration and six-position receiver extension. The designation does not establish the legal classification of a completed firearm.

Does the kit include a lower receiver?

No. The lower receiver is not included.

What receiver extension comes with the kit?

The Compression Series includes a mil-spec six-position receiver extension instead of the previously offered micro pistol buffer tube.

Does the receiver extension match the selected color?

Yes. The receiver extension features a coordinated anodized finish corresponding to the selected color option. Actual finish shades may vary between components.

What colors are available?

Black, Blue, Bronze, Grey, Green, FDE, Pink, Red, Purple, Gold, and Clear.

Are the bolt carrier group and charging handle included?

Yes. The kit includes an M16-profile nitride bolt carrier group and a charging handle.

Is a stock included?

A stock is not identified as part of the specified package. The kit includes the six-position receiver extension.

Is the upper assembled?

The product offers an unassembled kit configuration and an assembled-upper option.

Is the kit itself a registered SBR?

No. The kit consists of firearm components and 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