$1,499.99
1 in stock
The CMMG Mk4 BANSHEE 300 is part of CMMG’s BANSHEE family of compact firearms built around the company’s Mk4 platform. CMMG identifies the BANSHEE as a line available in multiple calibers and configurations, including 9mm, .300 BLK, 5.56mm, .22 LR, 5.7x28mm, and others depending on the specific Mk-series configuration.
This particular listing includes a SIG SAUER ROMEO5 red dot optic, additional accessories as identified in the listing, and a case. Because CMMG has produced the BANSHEE in numerous configurations over its production history, the exact markings, barrel length, caliber, magazine configuration, and included components of the individual firearm should be confirmed from the firearm itself and the accompanying photographs.
For related products, visit our CMMG Firearms, 9mm Firearms, and Firearm Accessories collections.
The Mk4 BANSHEE uses the CMMG Mk4 platform and is part of CMMG’s compact BANSHEE family. CMMG describes the BANSHEE line as offering compact configurations, with availability across several calibers and operating configurations.
CMMG also explains that its previous 100, 200, and 300 equipment levels were consolidated beginning in 2022. Current BANSHEE models are produced with a standardized equipment level that CMMG says is equivalent to the previous 300-series configuration.
For an individual pre-owned or older-production firearm, the markings on the receiver and original documentation should therefore be used to establish the exact model designation.
CMMG lists 9mm among the calibers available for its Mk4 BANSHEE platform.
The 9mm chambering is an important part of identifying this particular firearm. Customers should verify the caliber marking directly on the firearm before selecting ammunition. Ammunition should always be appropriate for the specific firearm and chamber designation.
For additional information and related products, visit our 9mm Ammunition and 9mm Firearms pages.
One of the notable accessories included with this listing is a SIG SAUER ROMEO5 red dot optic. SIG describes the ROMEO5 as a compact 1x20mm red dot sight featuring a 2 MOA red dot, 10 illumination settings, MOTAC motion-activated illumination, and an M1913-compatible mounting interface.
According to SIG SAUER’s published specifications, the ROMEO5 has a 20mm clear aperture, weighs approximately 5.1 ounces, uses a CR2032 battery, and is rated IPX7 for waterproof performance. SIG lists a stated runtime of approximately 40,000 hours under specified conditions.
The ROMEO5 included with this firearm should be identified by its specific model and serial information. SIG SAUER currently maintains a safety-recall page for certain ROMEO5 models, including SOR52001 and 7400579. Customers should check the optic’s model and serial information against SIG’s official recall information before use.
For related products, browse our Red Dot Sights and Optics categories.
This listing includes a case along with the CMMG firearm and SIG ROMEO5 optic. Any additional accessories should be considered included only when they are specifically identified in the written description or shown in the product photographs.
The exact condition of each accessory should be evaluated independently. Cases, optics, mounts, magazines, and other components may show different levels of wear depending on previous use and storage.
For additional storage options, see our Gun Cases and Firearm Storage pages.
The condition of the individual CMMG BANSHEE should be determined from the photographs and written condition description accompanying the listing. Areas that may be relevant when documenting a pre-owned firearm include the receiver finish, barrel, controls, stock or brace configuration where applicable, sights, optic mounting hardware, and other external components.
The SIG ROMEO5 should likewise be inspected for lens condition, housing wear, battery compartment condition, mounting hardware, and model/serial information.
Any questions regarding the mechanical condition of the firearm should be evaluated by a qualified gunsmith or appropriately trained firearms professional.
CMMG provides official information about its BANSHEE platform through its support and knowledge-base resources. The company’s BANSHEE documentation covers available calibers, magazine information, and compatibility questions.
External resources:
These manufacturer resources should be used as the primary references for current specifications, manuals, compatibility information, and safety notices.
Always treat every firearm as loaded until you have personally verified that it is unloaded. Keep the muzzle pointed in a safe direction and keep your finger outside the trigger guard until you have made the decision to fire.
Read the manufacturer’s owner’s manual before operating, cleaning, maintaining, or modifying the firearm. Use only ammunition appropriate for the firearm’s caliber and chamber specification.
The included ROMEO5 optic should also be inspected for its model number and serial number, particularly because SIG SAUER maintains an active recall notice covering certain ROMEO5 configurations.
When the firearm is not in use, store it securely and prevent unauthorized access. Follow all applicable federal, state, and local laws regarding firearm storage, possession, transportation, and transfer.
Additional information is available through our Firearm Safety and FFL Transfer Information pages.
The CMMG Mk4 BANSHEE 300 9mm is a compact CMMG platform configuration with the distinctive BANSHEE designation. This particular listing includes a SIG SAUER ROMEO5 red dot optic and case, along with any additional accessories identified in the listing.
The SIG ROMEO5 provides a 1x optical configuration, 2 MOA red dot, multiple illumination settings, MOTAC motion activation, and an M1913 mounting interface according to SIG SAUER’s published specifications.
Customers should carefully review the individual firearm’s markings, caliber designation, condition, included accessories, optic model and serial number, and applicable transfer requirements before completing a transaction.
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