CMMG Mk 45 Guard

Submachine gun

CMMG Mk 45 Guard
Type	Submachine gun
Place of origin	United States
Production history
Designed	2017
Manufacturer	CMMG
Specifications
Cartridge	.45 ACP
Action	Radial delayed blowback
Feed system	box magazine

The CMMG Mk 45 Guard is a .45 ACP carbine developed by CMMG. The weapon is an M16 derivative and uses a radial delayed blowback operation.^[1]^[2]

Overview

The MkG45 Guard is a .45 ACP calibre, radial delayed blowback carbine. This system uses the rotation of the bolt head to accelerate the bolt carrier of an AR-15 pattern rifle. The bolt locking lugs are adapted to incorporate angles that rotate the bolt as it travels rearward under conventional blowback power. As the bolt rotates, it must accelerate the bolt carrier to the rear through an adapted cam-pin slot. This acceleration amplifies the effective mass of the bolt carrier, slowing the speed of the bolt head. This delay allows pressure to drop prior to extraction without the penalty of a heavier bolt carrier assembly.^[3] The system is similar to roller and lever-delayed blowback in that it uses the mass of the bolt carrier moving at a faster rate than the bolt head to delay the action from opening.

References

^ "CMMG MkG45 Guard Rifle - PCC in .45 ACP -". 2 May 2017.
^ "MkG45 GUARD: CMMG Unleashes New AR-15 in .45 ACP". 26 April 2017.
^ "CMMG Mk45". Archived from the original on 2018-10-08. Retrieved 2018-10-08.

ArmaLite AR-10 derivatives

Direct gas impingement

Battle rifles

Standard	ArmaLite AR-10
Sniper rifles	Colt Canada C20 DMR L129A1 M110 Semi-Automatic Sniper System M110A1 Rifle Marine Scout Sniper Rifle Sako M23 SR-25 Zbroyar Z-10

Rifles

Standard	ArmaLite AR-15 M4-WAC-47 M16 rifle variants CMMG Mk47 Mutant Colt ACR Colt CM901 Colt Canada C7 Barrett M468 KH-2002 KS-1 La France M16K LMT MARS-L LR-300 Mk 12 Special Purpose Rifle Norinco CQ Remington R4 Safir T-series SEAL Recon Rifle Squad Advanced Marksman Rifle Squad Designated Marksman Rifle
Carbines	Carbon 15 CAR-15 M4 carbine Bushmaster M4-type Carbine Colt Canada C8 Close Quarters Battle Receiver Olympic Arms OA-93

PDWs

Machine guns

Colt Automatic Rifle

Semi-automatic rifles

Shotguns

Pistols

Other mechanism of action

Battle rifles

Standard	Heckler & Koch HK417 MKE MPT-76
Sniper rifles	LWRC REPR LWRC SABR MKE KNT-76

Rifles

Standard	CAR 816 Colt Advanced Piston Carbine Adcor A-556 Barrett REC7 Haenel MK 556 Heckler & Koch HK416 LWRC M6 M231 Firing Port Weapon MKE MPT-55 Pindad AM1 PVAR Remington R5 RGP SOCIMI AR-831 T65 T86 T91
Carbines	G13 carbine MKE KAAN-717 SIG516 Special Operations Assault Rifle SIG MCX

Submachine guns

Machine guns

Semi-automatic rifles

Centrefire	Heckler & Koch MR223 Heckler & Koch MR308 Ruger SR-556 SIG Sauer SIGM400
Rimfire	Smith & Wesson M&P15-22

Pistols

LWRC PSD

v t e Delayed blowback firearms
Lever delayed	AA-52 Benelli B76 Cristóbal Carbine Danuvia 43M Dlugov FAMAS FN Five-seven FNAB-43 Garanin MAC-58 Sterling 7.62 ST Kinetics CPW TKB-517 AVB-7.62
Roller delayed	Calico M960 CEAM Modèle 1950 CETME Ameli CETME rifle CETME Model L Gerät 03 prototype HK G3 HK G41 HK MP5 HK P9 HK PSG1 HK MSG90 HK SR9 HK UCP HK21 HK33 HK43 HK SL6 HK SL7 MG 45 PTR 91F SIG 510 SIG MG 710 SRM Arms Model 1216 StG 45(M)
Gas delayed	Arsenal P-M02 Grossfuss Sturmgewehr Heckler & Koch P7 M-77B Steyr GB Volkssturmgewehr 1-5 Walther CCP
Hesitation locked	M50 Reising Remington Model 51 Remington Model 53 Remington R51 SIG MKMO
Flywheel delayed	Barnitzke machine gun MGD PM-9
Radial delayed	CMMG Mk 45 Guard
Toggle delayed	Schwarzlose machine gun T1E3 Model 32 semi-automatic rifle
Vector delayed	Jatimatic KRISS Vector