• Skip to main content
  • Skip to primary sidebar
The Loadout Room

The Loadout Room

Professional Gear Reviews

Hardcore Gear and Adventure

Menu
  • Shooting
        • Pistol
        • Pistol Accessories
        • Rifle
        • Rifle Accessories
        • Shotgun
        • Machine Guns
        • Air Guns
        • Ammunition
        • Optics and Sights
        • Weapon Lights
        • Tips & How-To
        • Concealed Carry
        • Holsters
        • Suppressors
        • Precision Rifle Shooting
        • Firearms Training
        • m243The M24: America’s Headhunter
        • skorpFull-Auto Fun — Shooting the full-Auto vz. 61 Škorpion
        • p320-full-leftSIG Sauer M17/M18/P320 Pistol Just Can’t Seem to Escape Safety Controversies
        • TISAS_10100520_1__98179Tisas 1911A1 U.S. Army Review: Best Budget .45 ACP WW2 1911 Clone?
    • Close
  • Gear Reviews
      • Mission Gear
      • Camping Gear
      • Survival Gear
      • Medical Gear
      • Adventure & Travel
      • Knives & Tools
      • Overland
      • Disaster Preparedness
      • Footwear
      • Womens Gear & Clothing
        • Hunting in TexasThese 5 ATV Dealers Will Get You Ready For Hunting Season in Texas
        • ac65a540-2ef3-4598-8d11-afdf53f46e94.__CR0,0,970,600_PT0_SX970_V1___Streamlight ProTac Rail Mount HL-X: A Thoroughly Bright Review
        • Bluetti 2 handsfree power backpackBluetti Handsfree 2 Review: The Ultimate Power Backpack for Off-Grid Adventurers
        • The Gallagator 10 day pack on the shoreline next to a hiking trail.Day Pack – Mystery Ranch Gallagator 10 – The Best Yet?
    • Close
  • Men’s Lifestyle
      • Fitness
      • EDC
      • Eyewear
      • Watches
      • Electronics & Technology
      • Downtime
      • Mens Clothing & Accessories
      • Manly Skills
      • Style & Grooming
      • Gentleman Drinks
      • Crate Club
        • Tom and Blake Sell TeaHow Sasquatch Tea Is Revitalizing a Stagnant Tea Market With Veterans and Outdoorsmen in Mind
        • redcat-blackwidow-articleheaderWar of Words: In the Ultra-Competitive Defense Tech Industry, Storytelling is a Secret Weapon
        • Photoroom_20250525_074933Juggernaut Tactical Frame Review: The Best Upgrade for Your 365
        • craft holstersCraft Holsters Makarov Tuckable IWB Holster Report
    • Close
  • News
  • Video Demo
  • Buying Guides
  • Shop
  • Advertise
Rifle

Want to Shoot the Mighty 450 SMC Cartridge? No Problem with CMMG’s GUARD

February 6, 2018 by The Arms Guide Leave a Comment

CMMG’s MkG GUARD is an AR15 rifle that is chambered in .45 ACP and feeds from factory Glock magazines. At the heart of the GUARD is the patent pending Radial Delayed Blowback operating system that works to harness the strong recoil impulse of .45 ACP.  After extensive durability testing, CMMG is proud to announce that the GUARD is safely rated for 450 SMC.

For those unfamiliar with 450 SMC, Triton first conceived the cartridge in 2001. The design was ultimately taken over and completed by DoubleTap ammunition years later. In essence, it is a magnum version of .45 ACP that offers ballistics that are comparable to 10mm. It is a true “stopper” that delivers energy capable of taking down big game.
While the 450 SMC uses a case with the same outer dimensions as .45 ACP, there are a few significant differences that allow DoubleTap to load 450 SMC with five to six thousand pounds per square inch of pressure more than a standard .45ACP. First, the 450 SMC uses a small magnum rifle primer instead of the large pistol primer. This modification allows the hardened case to be thicker at the base.  Second, the brass is manufactured from the ground up to handle up to 30,000 pounds of pressure. The result is a dual-purpose cartridge that is exceptional for both hunting and personal defense.
While 450 SMC can be safely run in any .45 ACP that is rated for +P ammunition, the amount of rearward force created by such a hot load would potentially be problematic from a straight blowback AR15.  CMMG’s GUARD platform can overcome these issues, however, thanks to the Radial Delayed Blowback operating system.
The Radial Delayed Blowback system uses up some of the recoil impulse of the spent round to unlock the rotating bolt from the barrel extension. This mitigates the leftover rearward force that then drives the carrier back to cycle the action. By eliminating some of this rearward force during the unlocking sequence, the GUARD requires less weight in the bolt carrier group and buffer to safely cycle. This reduction in reciprocating mass results in less felt recoil for the end user.
Here’s how the 450 SMC stacks up against 10mm out of a 16-inch barrel (data provided by DoubleTap Ammunition):
 
450 SMC
DOUBLETAP AMMUNITION
MUZZLE VELOCITY
MUZZLE ENERGY
 
450 SMC 160gr. BARNES TAC-XP LEAD FREE
1740 FPS
1076 FT LBS
450 SMC 185gr. BONDED DEFENSE® JHP
1725 FPS
1223 FT LBS
450 SMC 230gr. BONDED DEFENSE® JHP
1400 FPS
1001 FT LBS
450 SMC 255gr. HARDCAST SOLID ™
1300 FPS
958 FT LBS
 
10MM AUTO
DOUBLETAP AMMUNITION
MUZZLE VELOCITY
MUZZLE ENERGY
 
10MM 165gr. BONDED DEFENSE® JHP
1700 FPS
1059 FT LBS
10MM 180gr. BONDED DEFENSE® JHP
1600 FPS
1023 FT LBS
10MM 200gr. HARDCAST SOLID™
1590 FPS
1123 FT LBS
10MM 230gr. HARDCAST SOLID™
1350 FPS
931 FT LBS

CMMG Lifetime Quality Guarantee

CMMG, Inc. will guarantee its products against defects in material or workmanship. CMMG, Inc. will repair, replace or substitute part(s) (at CMMG, Inc. discretion) at no charge to the customer if a defect of material or workmanship is found. All service work must be carried out by CMMG, Inc. The warranty applies to the original purchaser and a copy of the invoice or proof of purchase must be provided when submitting for service or work.

About CMMG:

CMMG began in central Missouri in 2002 and quickly developed into a full-time business because of its group of knowledgeable and passionate firearms enthusiasts committed to quality and service. Its reputation was built on attention to detail, cutting edge innovation and the superior craftsmanship that comes from sourcing all their own parts. By offering high quality AR rifles, parts and accessories, CMMG’s commitment to top-quality products and professional service is as deep today as it was when it began.

Share This

More From The Loadout Room

Comments

Primary Sidebar

Most Read

  • Mossberg 930: the affordable 12 gauge auto-loader
    Mossberg 930: the affordable 12 gauge auto-loader
  • SIG Sauer M17/M18/P320 Pistol Just Can't Seem to Escape Safety Controversies
    SIG Sauer M17/M18/P320 Pistol Just Can't Seem to Escape Safety Controversies
  • Black Widow and the Brain: Palladyne and Red Cat Prove the Future Is Autonomous
    Black Widow and the Brain: Palladyne and Red Cat Prove the Future Is Autonomous
  • Mossberg Shockwave Versus Remington Tac 14
    Mossberg Shockwave Versus Remington Tac 14
  • Bluetti Handsfree 2 Review: The Ultimate Power Backpack for Off-Grid Adventurers
    Bluetti Handsfree 2 Review: The Ultimate Power Backpack for Off-Grid Adventurers

Find Us on Facebook

Recent Comments

  • Winston Smiths on Mossberg 930: the affordable 12 gauge auto-loader
  • Jared Mize on The Fairbairn-Sykes Fighting Knife: A Commando Blade That Changed Special Forces Forever
  • GomeznSA on MAC-10: The Wild History of America’s Most Iconic (and Overrated) Submachine Gun

Latest From SOFREP

Op-Ed

The Bolduc Brief:  Israel’s Humanitarian City Plan – A Flawed Approach to Peace

Firearms

The M24 Sniper Weapon System: America’s Headhunter

US Politics

The Dirty Secret Behind America’s Rigged Politics: Gerrymandering, Term Limits, and Campaign Finance Gone Wild

News

Morning Brief: Putin Pushes Iran Toward ‘Zero Enrichment’ Nuclear Deal, Pacific Allies Train to Fight China

Military Content Group

© Copyright 2025 Military Content Group · All Rights Reserved.

  • Privacy Policy
  • Terms of Use
  • Advertisers