Ultimate Reloader CMMG AR Recap

CMMG is updating their full line of AR’s, so I thought this would be a great opportunity to “look back” at my CMMG AR stories before looking towards new experiences with the refreshed lineup. Today I’ll walk you through each of Ultimate Reloader’s CMMG ARs, what I’ve done with each, and why I like each of them.


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About CMMG 

From the CMMG website: 

CMMG is the leading manufacturer of AR15 rifles, components and small parts. CMMG has carved out a reputation for innovation by engineering AR technologies that blaze new trails. While CMMG will always step up to meet market demand, we pride ourselves on looking beyond what’s already been done, leading to more options for consumers. We strive to deliver new and unique products to market that will redefine how the AR platform is viewed. We are CMMG and we Aim to Be Different ™


The Banshee is CMMG’s pistol line. It has a full-size magwell for some models (Ex: 4.6x30mm, 300 BLK) and special magwell for others (Ex: 9mm) and is chambered in 11 calibers:  22LR, 300 BLK, 308 WIN, 40 S&W, 45 ACP, 4.6x30mm, 5.56x45mm, 5.7x28mm, 7.62x39mm, 9mm and 10mm.

I personally do a lot of shooting with my 9mm Banshees, but had the opportunity to do a full review on the 10mm while CMMG was visiting the UR Ranch.

I have two models of 9mm Banshee’s, the MK9 (straight blowback) and the MKGs (radial delay blowback. Both favor subsonic loads – they work especially well with a suppressor. 

Looking for subsonic 9mm loads? These two videos may be able to help.

My “subsonic magic load,” discussed in the video above, performed well, resulting in what I call “fun overdrive.” 

CMMG has also brought 4.6x30mm to the AR platform. We recently did a full review on the channel and discovered it’s a fun round to shoot! 

Its many advantages include low recoil, high magazine capacity and a hopeful future in affordability. I run a SilencerCo Omega 300 on mine but have also shot it with the Hybrid which I currently have on the CMMG Resolute 6.5 Grendel.


The Resolute is CMMG’s compact carbine. Barrels typically measure 16″ and models were available in three tiers: Resolute 100, Resolute 200, and Resolute 300. This model lineup  (across the board) has been simplified during CMMG’s recent all-model refresh. 

I have a resolute chambered in 6.5 Grendel. The 6.5 Grendel PowerBolt has the same diameter as an AR-10 bolt, but is shorter. I’ve had stunning results with this rifle. Shooting off of a bipod on the ground, I achieved 5-shot groups measuring about ⅓ MOA. 

My second Resolute is chambered in 350 Legend.

It is more of a conventional AR with a forged upper and lower. This cartridge has become very popular in states that require straight-wall cartridges for hunting. It also provides an opportunity for those sportsmen and women to utilize a semi-automatic AR-platform. 

All Resolutes come with an adjustable RIPSTOCK. You can collapse it and simply pull on the buttstock to extend it.


Endeavor is CMMG’s line of premium long range rifles featuring an M-Lok free float handguard, fixed stock and 18″ to 24″ barrels.

The 6.5 Creedmoor Endeavor is a full size AR-10 platform rifle. Testing this gun at 1,000 yards, my first shot hit on a 10″ x 14″ target with factory ammo. 


The 6mm ARC is a smaller gun than the 6.5 Creedmoor. CMMG was actually one of the first firearm manufacturers to offer a factory gun in this caliber.

This particular rifle was part of a recent accurizing project I worked on with gunsmith Gordy Gritters that took an inch group at 100 yards down to a ⅓” at 100 yards with factory ammo.

If you have a CMMG AR, drop a comment and tell me about yours! I’m looking forward to testing CMMG’s newest offerings. 

Get the Gear

CMMG AR’s: Banshee, Resolute, Endeavor

SilencerCo Osprey 45 Suppressor 

SilencerCo Omega 300

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Gavin Gear

One thought on “Ultimate Reloader CMMG AR Recap”

  1. Gavin: Enjoyed your post and I have a 6.5 AR Grendel that I would like to accurize so could you point me in the direction where I could find out or at least read about what’s involved in that process.

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