The new 9mm GUARD from Missouri based manufacturer CMMG is an AR-15 pistol caliber carbine (PCC). Not just another Colt clone, the GUARD uses CMMG’s patent pending Radial Delayed Blowback system and is fed from Glock 33 round magazines. The Guard has fully functional AR-15 controls, including last round bolt hold open. The 9mm Guard is available in six models including pistols.
I have had my 9mm Guard for three weeks now and I have fired over 1000 rounds of varied ammunition. The only malfunctions I have had were magazine induced. I was an earlier adopter of the pistol caliber carbine starting with the Colt SMG, MP-5 and the Ruger Police Carbines. The Guard is a mature design which shoots like AR. The Colt pattern mags used by other guns had more than their share of problems. The Guard ran great with Glock factory magazines of all capacities and (surprisingly) functioned well with some aftermarket magazines as well.
Magazines are important and already having a bunch of Glock mags made the Guard more desirable. During one of the panics awhile back, I bought some unmarked 33 round glock pattern magazines. I was told they were from Korea. They looked good and they ran in pistols, but the feed lips were not exactly the same as Glock mags. Other 9mm ARs would not tolerate these mags. Imagine my surprise when the Guard ran with them (well, all but one of them).
Many current AR PCCs (even the expensive ones) lack a bolt hold open. This slows your reloads and conflicts with habits formed shooting conventional ARs. The Guard has a full functional last round open with a dual-pinned, fully machined bolt catch linkage, using a standard bolt catch spring. It works every time.
My Guard is Cerakoted in an optional Burnt Bronze finish. I added the buffer weight kit because I wanted to shoot +P ammo and hang a suppressor on it. Even with the extra mass, the Guard is smooth shooter. If you shoot light bullets and tune the bolt weight, it will be the go to gun in competition with .22 like recoil.
Over the years, I have shot most every rifle shaped platform that chambers 9mm. What ever your application, the GUARD in 9mm is a great option. I would not hesitate to use the Guard for home defense, PCC competition, or as a plinker to train AR skills at 9mm prices. A 124gr jacketed hollow point from a 16 inch barrel will have all the energy transfer you need for urban predators. With a 33 round magazine, repeat as necessary.
One huge training benefit of the PCC is shooting pistol steel. You can do drills with plate racks, Texas Stars and other targets that rifle caliber safety would never allow and boy is it fun. Something you quickly figure out when you shoot the same drills with handgun then a PCC is how much faster the PCC is. On most drills the time is cut in half. This translates directly into the real world. My CTS steel targets took most of this 1000 rounds from 10 to 50 yards with no wear and tear.
Precision is also a benefit. I put a SIG Sauer® ROMEO3 Mini Reflex Sight on my Guard. Taking a head sized target at 25 yards is simple with the guard. I was regularly shooting 3 inch groups standing unsupported. At 50 and 100 yards there was a couple of inches of drop and the groups grew to 6 inches. I am sure with magnified optics and good ammo you could get small groups at 200 yards.
With the Geissele Automatics SSA trigger, I was able to get .15 second splits while staying on target at 25 yards on demand. The gun has low felt recoil even with +P loads. It handles well and shoots fast. I was a little worried that people hearing my shots on the next range over would think I had a machinegun, but I was having so much fun I couldn’t stop. When 5 or 6 rounds hit steel .15 seconds apart it is pretty cool.
The big news here is the GUARD’s Radial Delayed Blowback system. The bolt carrier group (BCG) that looks like those found on a regular AR-15 but with a different operation. Simple and elegant, the bolt key is forced to rotate and unlock slowing down the BCG just enough to safely cycle 9mm while simultaneously keeping the BCG and buffer lighter than Colt pattern 9mm AR15s reducing felt recoil.
CMMG developed the Radial Delayed Blowback to handle .45 ACP, the first caliber introduced in the GUARD platform. The recoil impulse of .45 ACP didn’t lend itself to merely adding additional weight to the carrier and buffer. While it appears to have a standard AR15 bolt carrier group, the Guard bolt is different in some important ways. . The bolt key doesn’t pass gas, it is there to grab the charging handle. As blowback pressure pushes, it unlocks the bolt, delaying opening just enough to allow the bolt to reliably cycle.
In a 9mm straight blowback system, only the weight of the bolt and buffer mitigate the recoil impulse, the Guard bolt and buffer weight are much lighter which means less felt recoil as those masses move. The combined difference in weight of the bolt carrier group and buffer when comparing straight blowback versus Radial Delayed Blowback can be as much as 6.5 ounces.There is an Action Tuning Kit (bolt weight set), sold separately, which allows the user to change the weight of the bolt to precisely match the recoil impulse. This is going to come in handy for suppressor users and short barreled pistols.
The MkGs GUARD comes with one 33-round factory Glock magazine. Bolt weight kits will be sold separately for those who wish to fine-tune the GUARD for suppressor usage.
Rifle, MkGs DRB2, 9mm
PRODUCT DESC: Rifle, MkGs DRB2, 9MM
BARREL: 16″ M4 4140CM SBN, 9mm
MUZZLE: CMMG SV Brake, Threaded ½-36
HAND GUARD: CMMG RKM14
FURNITURE: Magpul MOE Pistol Grip, Magpul CTR stock with 6-pos mil-spec receiver extension
RECEIVERS: Billet 7075-T6 AL Lower, Forged 7075-T6 AL Upper
TRIGGER: Geissele Automatics SSA
MAGAZINE: Glock 9mm 33 round
WEIGHT: 6.2 lbs (UNLOADED)
LENGTH: 32.5” (STOCK COLLAPSED)
I really like this gun and will be using it at home and for competition. It does everything well and the quality is among the best in the industry. It is fun and effective in any role.
Get can your very own Guard HERE
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.
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.
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