CMMG 57D0476 Replacement Barrel Kit with Bolt Carrier Group 5.7x28mm 16.10″ Threaded Black Radial Delayed Blowback Fits AR-Platform

The 16.1 5.7x28mm Barrel and BCG Kit is just the thing for building a carbine length AR in 5.7x28mm using CMMGs patented Radial Delayed Blowback operating system. Unlike typical direct blowback systems Radial Delayed Blowback not only reduces the weight in your BCG but it results in less felt recoil than a straight blowback system without sacrificing key features like last round bolt hold open. CMMGs 5.7x28mm Barrel and Bolt Kits are designed to be assembled into a Mk4/mil-spec AR15 upper and work with either a CMMG Mk57 lower receiver or Mk4/AR15 mil-spec lower receiver (when using CMMG 5.7 AR Conversion Magazines).

Brand	CMMG
Category	Rifle Barrels
Series	Kit
Model	Replacement Barrel
Caliber	5.7x28mm
Firearm Fit	AR-Platform
Length Range	16″-20″
Color	Black
Material	4140 Chromoly Steel
Finish	Salt Bath Nitride
Length	16.10″
Includes	Bolt Carrier Group
Thread Pattern	1 / 2″x28
Weight	2.50 lbs

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