CMMG 5.7x28mm AR-style Barrel & BCG Kit, 16.1" Stainless Steel Barrel

Buyer's Club
$404.99
Non-Member $449.99
Buyer's Club 4-Pay Members can pay with 4 interest-free monthly installments of:
$101.25
ALL CLUB ORDERS $49+ SHIP FREE!
In Stock
    • Shipping restrictions apply to this product under some jurisdictions. Known age, state and local shipping restrictions are applied at checkout and may result in changes to an order. PLEASE NOTE: We do not accept returns of Ammunition for safety reasons. NEVER use any Ammunition unless it is specifically designed for your firearm.
    • This item cannot ship to Canada.

Key Features

  • 5.7x28mm
  • 16.1" 416R stainless steel barrel with 1/2x28 thread
  • Radial Delayed Blowback bolt carrier group
  • Both the barrel and BCG are designed to work with a CMMG® Mk57 lower or standard mil-spec AR-15 lower
  • Made in USA
  • All NFA rules apply
  • SATISFACTION GUARANTEE

    Order with complete confidence! Your satisfaction is guaranteed, period! We stand behind every item we sell. If you're not happy within 90 days of shipment, just return the item with your invoice and we'll promptly refund your merchandise total. See More Details

  • LOWEST PRICE GUARANTEE

    For everything to outfit your passion...at the Lowest Prices, Guaranteed! If you find a lower advertised price for an item we sell, let us know at the time of purchase or within 10 days of placing your order and we will refund you the difference. See More Details

  • Easy Returns

This CMMG Barrel & BCG Kit allows you to build your own AR chambered in 5.7x28mm using CMMG's outstanding Radial Delayed Blowback operating system. Unlike typical blowback systems, Radial Delayed Blowback not only reduces the weight in your BCG, it also reduces felt recoil—allowing you to stay on target and make faster follow-up shots.

Both the barrel and BCG are designed to fit CMMG's Mk57 lower or a standard AR-15 lower (when using CMMG's 5.7x28mm Conversion Magazine). The barrel is made from premium 416R stainless steel and features standard 1/2x28 threads for muzzle accessories. The bolt carrier group features a salt bath nitride finish for corrosion resistance.

If you've been dreaming about building an AR in the high-speed, deep-penetrating 5.7x28mm rounds, this is the Kit for you.

  • 16.1" 416R stainless steel barrel with 1/2x28 thread
  • Radial Delayed Blowback bolt carrier group
  • Both the barrel and BCG are designed to work with a CMMG® Mk57 lower or standard mil-spec AR-15 lower
  • Bolt carrier group features a salt bath nitride finish
  • Backed by the CMMG Lifetime Quality Guarantee
  • All NFA rules apply

Order today!

Key Specifications

  • Item Number: 721002
  • Caliber: 5.7x28mm
  • Action: Semi-automatic
  • Barrel Length: 16.1"
  • Barrel Material: 416 stainless steel
  • Barrel Thread: 1/2x28
  • Barrel Twist: 1:9"
  • Overall Weight: 2.5 lbs.
  • Country of Origin: USA
  • Mfg. Number: 57D3F68
CMMG 5.7x28mm AR-style Barrel & BCG Kit, 16.1" Stainless Steel Barrel
CMMG 5.7x28mm AR-style Barrel & BCG Kit, 16.1" Stainless Steel Barrel
0 Reviews
Buyer's Club $404.99 Non-Member $449.99