M&M Guns and Supplies

M&M Guns and Supplies serves the St. Peters, Missouri area with a full inventory of firearms, ammunition, optics, and hunting gear. The shop earned recognition as Saint Charles County's best for customer service in 2025, and they back that up with hands-on support and technical expertise.

Firearms - Rifles from manufacturers like Stoeger and HK (currently running sales on select models) - Shotguns and handguns across multiple calibers - Airguns including PCPs, spring-piston models, and CO2-powered options from Beeman, Benjamin, Crosman, and others

Ammunition & Components M&M carries ammunition across 100+ calibers, from common rounds like 9mm, .45 ACP, and 5.56 NATO to specialty loads including .300 PRC, 6.5 Creedmoor, and large magnum cartridges. Brands include Federal, Hornady, Remington, Winchester, Fiocchi, and many others.

Optics, Knives & Accessories Scopes, red dots, and tactical gear round out their selection alongside quality knife options.

• •Scope Mounting & Boresighting - Get your optics installed and zeroed correctly
• •Firearm Cleaning - Professional cleaning services for your collection
• •Sight Installation - Expert installation of iron sights and other sighting systems (some exclusions apply)
• •Minor Machine Work - Limited gunsmithing capabilities
• •Firearms & NFA Transfers - Licensed to handle transfers and special weapons documentation

M&M ships firearms and restricted items to most states, but does not ship to California, New Jersey, Connecticut, Illinois, New York, Hawaii, Maryland, Massachusetts, Colorado, Rhode Island, Delaware, Washington D.C., or other states with firearms and magazine restrictions. International shipping is not available. Orders that violate these restrictions will be canceled and refunded.