The CMMG Banshee Mk4 pistol in .300 Blackout (brand part no. 30AB20F-AB) steps up to a 12.5-inch barrel for shooters who want more velocity from their subsonic and supersonic .300 Blackout loads without losing the AR pistol’s compact footprint. CMMG tops the muzzle with a Zeroed linear compensator threaded 5/8×24 and wraps the barrel in an EML11 M-LOK handguard with full-length M-LOK slots on both sides and the bottom. A CMMG RipBrace ships installed alongside a Zeroed drop-in trigger and a Zeroed ambidextrous charging handle, with billet 6061 upper and forged 7075 lower receivers. The pistol ships with one 30-round Magpul PMAG. Among AR pistols, this longer-barreled Banshee Mk4 favors shooters who want more out of every .300 Blackout round fired.

Key Specifications

• The chambering is .300 AAC Blackout.
• Magazine capacity is 30 rounds.
• The barrel measures 12.5 inches.
• The muzzle is threaded 5/8×24 and wears a Zeroed linear compensator.
• The handguard is a CMMG EML11 M-LOK design.
• A CMMG RipBrace ships installed.
• The trigger is a Zeroed drop-in trigger.
• The charging handle is a Zeroed ambidextrous design.
• The receivers are a billet 6061 upper and forged 7075 lower.
• The pistol ships with one 30-round Magpul PMAG.

Frequently Asked Questions

Why choose the 12.5-inch barrel over the 8-inch? The longer barrel squeezes more velocity out of .300 Blackout loads while keeping the AR pistol’s compact profile.

Is the barrel threaded? Yes, 5/8×24, with a Zeroed linear compensator installed.

What magazine ships with the pistol? One 30-round Magpul PMAG.

Buy the CMMG Banshee Mk4 Pistol, 12.5-Inch .300 Blackout

Extra barrel length and CMMG’s full Zeroed control package make this longer Banshee Mk4 a strong choice for .300 Blackout shooters. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.