CMMG Banshee

What Is the CMMG Banshee?

The Banshee is CMMG's compact pistol caliber AR — built on a dedicated upper and lower that are smaller than standard AR-15 components, optimized for the shorter pistol caliber cartridges it chambers. Unlike many PCCs that adapt full-size AR components to pistol calibers, the Banshee's reduced-scale upper and lower produce a more proportional, compact package. The defining technical feature is CMMG's Radial Delayed Blowback system — a significant engineering advancement over standard blowback operation.

Radial Delayed Blowback — Why It Matters

Standard blowback PCCs cycle by letting the case pressure push the bolt directly rearward — a simple system but one that produces violent, snappy cycling and significant felt recoil for pistol calibers. CMMG's Radial Delayed Blowback system delays the bolt opening using a rotating bolt head similar in concept to a rifle bolt, reducing the bolt's opening velocity and cycling violence. The result is a smoother, softer-cycling PCC that runs suppressed more cleanly and with less carrier tilt than blowback competitors. The Banshee running suppressed is one of the more refined suppressed PCC experiences available.

Banshee Configurations

Banshee 100 (Pistol) — The entry-level Banshee in pistol configuration. Standard components, AR pistol format without a stock. The most affordable Banshee entry point.

Banshee 200 (MkGs) — Mid-tier Banshee with enhanced components and improved ergonomics over the 100 series.

Banshee 300 (MkGs) — The premium Banshee configuration. Enhanced trigger, improved handguard, and additional refinements. The top of the Banshee production lineup.

SBR and Rifle Configurations — As of January 1, 2026, SBR conversions require only a standard background check. The Banshee is available in SBR configuration with a proper folding or collapsing stock, and in rifle configuration with a 16" barrel for states where pistol/SBR configurations face restrictions.

Caliber Options

The Banshee's Radial Delayed Blowback system supports a wider range of calibers than most blowback PCCs. Available calibers include 9mm, .45 ACP, 10mm Auto, .40 S&W, .22 LR, 5.7x28mm, and others depending on configuration. The 10mm Banshee is particularly popular — the Radial Delayed system handles 10mm's higher pressure without the violent cycling that blowback 10mm PCCs produce.

Banshee vs. Other PCCs

The Banshee competes with the Kel-Tec Sub-2000, CZ Scorpion, and Ruger PC Carbine in the PCC market. The Banshee's differentiators are the Radial Delayed Blowback system (unique in the production PCC market), the AR-pattern ergonomics for shooters already in the AR ecosystem, and the wide caliber selection. The Sub-2000 wins on foldability and price; the Scorpion wins on compactness; the Banshee wins on cycling refinement and suppressor compatibility.

FAQ

What calibers does the CMMG Banshee come in?
9mm, .45 ACP, 10mm Auto, .40 S&W, .22 LR, 5.7x28mm, and others depending on configuration.

What is Radial Delayed Blowback?
CMMG's patented operating system that delays bolt opening using a rotating bolt head, reducing cycling violence and felt recoil compared to standard blowback designs. Particularly beneficial for suppressed operation and higher-pressure calibers like 10mm.

Is the CMMG Banshee NFA regulated?
The Banshee ships as a pistol — no NFA paperwork in standard configuration. As of January 1, 2026, adding a stock (SBR conversion) requires only a standard background check.

Is the CMMG Banshee good for suppressed use?
Yes — the Radial Delayed Blowback system runs suppressed more cleanly than blowback competitors, with reduced bolt velocity and less gas blowback into the shooter's face. One of the most suppressor-friendly PCC designs available.

What is the difference between the Banshee 100, 200, and 300?
The 100 is the entry-level configuration; the 200 adds enhanced components; the 300 is the premium version with improved trigger, handguard, and overall refinements. All share the same Radial Delayed Blowback operating system.