+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5" Rdb Black 57D2424

Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5'' Rdb Black
Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5'' Rdb Black
1 of 1 images
Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5'' Rdb Black

Tap Tap to Zoom

Questions & Answers
Color: Black Finish: Matte Caliber: 5.7x28mm Barrel Length: 5 inAdditional Features: Threaded Dimensions: 1.90 X 12.15 X 16.20 in

Code: 2CM-ATB-57D2424

MPN: 57D2424

UPC: 816422029112

Product No Longer Available

Product Info for Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5" Rdb Black

The 5.7x28mm Barrel and BCG Kit allows you to build an AR in 5.7x28mm using CMMG's 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. CMMG's 5.7x28mm Barrel and Bolt Kits are designed to work with either a CMMG Mk57 lower receiver or with a standard AR15 lower receiver (when using CMMG 5.7 AR Conversion Magazines).image

Package Contents:

  • Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5" Rdb Black

Ammunition

1–18 / 18
Previous
Blazin' Deal
Fiocchi Range Dynamics 5.7x28mm 62 Grain FMJ Brass Cased Centerfire Pistol Ammo, 50 Rounds, 57SUB62
Fiocchi Range Dynamics 5.7x28mm 62 Grain FMJ Brass Cased Centerfire Pistol Ammo, 50 Rounds, 57SUB62
(4)
List: $42.10 (Save 41%)
$24.99
$0.50/Round
FN America FN SS198LF 5.7X28 27 Grain LF JHP Pistol Ammo, FNH10700021
FN America FN SS198LF 5.7X28 27 Grain LF JHP Pistol Ammo, FNH10700021
(3)
List: $81.33 (Save 32%)
$55.69
$1.11/Round
FN America GUNR 5.7X28, 40 Grain, Pistol Ammo, 50 Rounds, 10700032
FN America GUNR 5.7X28, 40 Grain, Pistol Ammo, 50 Rounds, 10700032
(1)
List: $51.48 (Save 36%)
$32.79
$0.66/Round
Fiocchi Range Dynamics 5.7X28mm 41/40 Grain FMJ/THP Brass Cased Rifle Ammo, Bulk Pack, 400 Round, 57COMPT
Fiocchi Range Dynamics 5.7X28mm 41/40 Grain FMJ/THP Brass Cased Rifle Ammo, Bulk Pack, 400 Round, 57COMPT
List: $298.00 (Save $22.81)
$275.19
$0.69/Round
Speer Gold Dot 5.7x28mm 40 Grain Hollow Point Centerfire Pistol Ammo, 50 Rounds, 25728GD
Speer Gold Dot 5.7x28mm 40 Grain Hollow Point Centerfire Pistol Ammo, 50 Rounds, 25728GD
(4)
List: $91.99 (Save 11%)
$81.69
$1.63/Round
Fiocchi Hyperformance Defense 5.7x28mm 35grain Jacketed Frangible Brass Cased Pistol Ammo, 50 Rounds, 57JF35
Fiocchi Hyperformance Defense 5.7x28mm 35grain Jacketed Frangible Brass Cased Pistol Ammo, 50 Rounds, 57JF35
(4)
List: $72.29 (Save 13%)
$63.09
$1.26/Round
FN America 5.7x28mm 27 Grain Lead Free Jacketed Hollow Point Brass Case Pistol Ammunition
FN America 5.7x28mm 27 Grain Lead Free Jacketed Hollow Point Brass Case Pistol Ammunition
As Low As (Save Up to 24%)
$56.89
$1.14/Round
See all 2 models
Vanguard Outfitters Blackfang Obsidian Dragon 7x28 34 Grain BFD V57 Brass Cased Rifle Ammo, 25 Rounds, 25, VGBFO
Vanguard Outfitters Blackfang Obsidian Dragon 7x28 34 Grain BFD V57 Brass Cased Rifle Ammo, 25 Rounds, 25, VGBFO
List: $65.99 (Save 13%)
$57.29
$2.29/Round
Best Rated
Fiocchi Hyperformance Defense 5.7x28mm 40grain Tipped Hollow Point Brass Cased Pistol Ammo, 50 Rounds, 57PT40
Fiocchi Hyperformance Defense 5.7x28mm 40grain Tipped Hollow Point Brass Cased Pistol Ammo, 50 Rounds, 57PT40
(14)
List: $52.99 (Save 38%)
$32.99
$0.66/Round
Vanguard Outfitters Subsonic 5.7x28mm 55 Grain Solid Copper Brass Cased Rifle Ammo, 25 Rounds, 25, VGSub
Vanguard Outfitters Subsonic 5.7x28mm 55 Grain Solid Copper Brass Cased Rifle Ammo, 25 Rounds, 25, VGSub
List: $55.99 (Save 21%)
$44.29
$1.77/Round
Vanguard Outfitters GPM 5.7x28 36 Grain Monumental VO Brass Cased Rifle Ammo, 25 Rounds, 25, VGGPM
Vanguard Outfitters GPM 5.7x28 36 Grain Monumental VO Brass Cased Rifle Ammo, 25 Rounds, 25, VGGPM
List: $39.75 (Save $2.36)
$37.39
$1.50/Round
Federal Premium Centerfire Handgun Ammunition 5.7x28mm 40 grain Hornady V-Max Brass Cased Centerfire Rifle Ammo, 50 Rounds, SS197SR
Federal Premium Centerfire Handgun Ammunition 5.7x28mm 40 grain Hornady V-Max Brass Cased Centerfire Rifle Ammo, 50 Rounds, SS197SR
List: $75.00 (Save 41%)
$44.59
$0.89/Round
Hornady Black, 5.7x28mm, 40 Grain, V-MAX Centerfire, Rifle Ammo, 25 Rounds, 90001-25RD
Hornady Black, 5.7x28mm, 40 Grain, V-MAX Centerfire, Rifle Ammo, 25 Rounds, 90001-25RD
(1)
List: $35.53 (Save 17%)
$29.49
$1.18/Round
FN America SS197SR 5.7x28mm 40 Grain Hornandy V-Max Brass Cased Pistol Ammo, 500 Rounds, FN10700015
FN America SS197SR 5.7x28mm 40 Grain Hornandy V-Max Brass Cased Pistol Ammo, 500 Rounds, FN10700015
List: $369.00 (Save $8.71)
$360.29
$0.72/Round
Fiocchi Range Dynamics 5.7X28mm 41/62 Grain FMJ Brass Cased Rifle Ammo, Bulk Pack, 400 Round, 57COMSUB
Fiocchi Range Dynamics 5.7X28mm 41/62 Grain FMJ Brass Cased Rifle Ammo, Bulk Pack, 400 Round, 57COMSUB
List: $313.00 (Save $23.21)
$289.79
$0.72/Round
Best Rated
Fiocchi Range Dynamics 5.7x28mm 40 Grain FMJ Brass Pistol Ammo, 150 Rounds, 57FMJ40
Fiocchi Range Dynamics 5.7x28mm 40 Grain FMJ Brass Pistol Ammo, 150 Rounds, 57FMJ40
(18)
List: $108.79 (Save 13%)
$94.99
$0.63/Round
Hornady Critical Defense, 5.7x28mm, 40 Grain, FTX Centrefire, Rifle Ammo, 25 Rounds, 90000-25RD
Hornady Critical Defense, 5.7x28mm, 40 Grain, FTX Centrefire, Rifle Ammo, 25 Rounds, 90000-25RD
(2)
List: $38.87 (Save 21%)
$30.59
$1.22/Round
FN America DFNS, 5.7X28, 30 Grain, Pistol Ammo, 50 Rounds, 10700030-50RD
FN America DFNS, 5.7X28, 30 Grain, Pistol Ammo, 50 Rounds, 10700030-50RD
List: $46.90
$46.59
$0.93/Round
Next

Related Products to Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5" Rdb Black

Image of CMMG Dissent, Mk3, .308 Winchester, 16.1 inch Upper Receiver 8 models CMMG Dissent, Mk3, .308 Winchester, 16.1 inch Upper Receiver (1) As Low As (Save Up to 13%) $1,199.00
Image of CMMG Dissent, Mk3, .308 Winchester, 16.1 inch Upper Receiver 8 models CMMG Dissent, Mk3, .308 Winchester, 16.1 inch Upper Receiver (1) As Low As (Save Up to 13%) $1,199.00
Image of CMMG Dissent, Mk3, .308 Winchester, 16.1 inch Upper Receiver 8 models CMMG Dissent, Mk3, .308 Winchester, 16.1 inch Upper Receiver (1) As Low As (Save Up to 13%) $1,199.00
Image of CMMG, Inc 22LR AR Conversion Kit, Bravo, 10 Rounds 2 models CMMG, Inc 22LR AR Conversion Kit, Bravo, 10 Rounds (6) As Low As (Save Up to 10%) $179.82 Blazin' Deal
Image of CMMG Dissent, Mk3, .308 Winchester, 20 inch Upper Receiver 8 models CMMG Dissent, Mk3, .308 Winchester, 20 inch Upper Receiver As Low As (Save Up to 12%) $1,189.00
Image of CMMG Dissent, Mk3, .308 Winchester, 20 inch Upper Receiver 8 models CMMG Dissent, Mk3, .308 Winchester, 20 inch Upper Receiver As Low As (Save Up to 12%) $1,189.00
Image of CMMG Dissent, Mk3, .308 Winchester, 20 inch Upper Receiver 8 models CMMG Dissent, Mk3, .308 Winchester, 20 inch Upper Receiver As Low As (Save Up to 12%) $1,189.00
Image of CMMG, Inc AR-15 Lower Reciever Parts Kit 2 models CMMG, Inc AR-15 Lower Reciever Parts Kit (73) As Low As (Save Up to 38%) $33.95 Best Rated
Image of CMMG, Inc AR-15 Lower Reciever Parts Kit 2 models CMMG, Inc AR-15 Lower Reciever Parts Kit (73) As Low As (Save Up to 38%) $33.95 Best Rated
Image of CMMG, Inc AR-15 Lower Reciever Parts Kit 2 models CMMG, Inc AR-15 Lower Reciever Parts Kit (73) As Low As (Save Up to 38%) $33.95 Best Rated
Image of CMMG DISSENT Mk4, 300BLK, 10.5in Upper Receiver 8 models CMMG DISSENT Mk4, 300BLK, 10.5in Upper Receiver (1) As Low As (Save Up to 20%) $1,079.00
Image of CMMG DISSENT Mk4, 300BLK, 10.5in Upper Receiver 8 models CMMG DISSENT Mk4, 300BLK, 10.5in Upper Receiver (1) As Low As (Save Up to 20%) $1,079.00
Image of CMMG DISSENT Mk4, 300BLK, 10.5in Upper Receiver 8 models CMMG DISSENT Mk4, 300BLK, 10.5in Upper Receiver (1) As Low As (Save Up to 20%) $1,079.00
Image of CMMG Dissent .45 ACP 6.5in Upper Group 8 models CMMG Dissent .45 ACP 6.5in Upper Group As Low As (Save Up to 12%) $1,079.00
Image of CMMG Dissent .45 ACP 6.5in Upper Group 8 models CMMG Dissent .45 ACP 6.5in Upper Group As Low As (Save Up to 12%) $1,079.00
Image of CMMG Dissent .45 ACP 6.5in Upper Group 8 models CMMG Dissent .45 ACP 6.5in Upper Group As Low As (Save Up to 12%) $1,079.00
Image of CMMG 9mm 5in Banshee Fixed Ejector Upper Group Receiver 6 models CMMG 9mm 5in Banshee Fixed Ejector Upper Group Receiver As Low As (Save Up to 10%) $829.99
Image of CMMG 9mm 5in Banshee Fixed Ejector Upper Group Receiver 6 models CMMG 9mm 5in Banshee Fixed Ejector Upper Group Receiver As Low As (Save Up to 10%) $829.99
Image of CMMG 9mm 5in Banshee Fixed Ejector Upper Group Receiver 6 models CMMG 9mm 5in Banshee Fixed Ejector Upper Group Receiver As Low As (Save Up to 10%) $829.99
Image of CMMG DISSENT 9mm, 6.5in Upper Receiver 7 models CMMG DISSENT 9mm, 6.5in Upper Receiver (1) As Low As (Save Up to 12%) $1,189.00
Image of CMMG DISSENT 9mm, 6.5in Upper Receiver 7 models CMMG DISSENT 9mm, 6.5in Upper Receiver (1) As Low As (Save Up to 12%) $1,189.00
Image of CMMG DISSENT 9mm, 6.5in Upper Receiver 7 models CMMG DISSENT 9mm, 6.5in Upper Receiver (1) As Low As (Save Up to 12%) $1,189.00
Image of CMMG Mk4 Resolute Upper Receiver Group 5 models CMMG Mk4 Resolute Upper Receiver Group (3) As Low As (Save Up to 19%) $729.99
Image of CMMG Mk4 Resolute Upper Receiver Group 5 models CMMG Mk4 Resolute Upper Receiver Group (3) As Low As (Save Up to 19%) $729.99

Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5" Rdb Black Unavailable & Discontinued Models

List of Unorderable Models

  • Cmmg, Inc Cmmg Barrel W/bolt Kit 5.7x28mm 5'' Rdb Black , MPN: 57D2424 , UPC: 816422029112 , Code: 2CM-ATB-57D2424
Compare (0)
1 item has been added
Add at least two items to compare