Brothers in Arms M4 Semi Auto CO2 Tactical

Part of the prestigious Brothers in Arms® series produced for Lee-Enfield (Guns) Ltd, this CO₂-powered M4 Tactical BB Air Rifle pays tribute to one of the most iconic military rifles of the modern era. The Brothers in Arms range honours the soldiers of all nations who fought through the conflicts of the 20th century, with faithful replica airguns including the Mosin Nagant M1944, AK-74, M1911 A1 and the legendary Lee-Enfield SMLE®.

Originally adopted by the U.S. military in 1994, the M4 Carbine became the standard frontline rifle thanks to its compact size, versatility and effectiveness. It first saw combat in Kosovo in 1999 and later widespread service during the Global War on Terror. Revered for its reliability and adaptability, the M4 remains a symbol of modern military firepower.

This CO₂-powered replica captures the look, feel and handling of the real M4. Powered by a single 12g CO₂ cartridge, it delivers fast, satisfying semi-automatic fire, launching .177 (4.5mm) steel BBs at speeds of up to 495 fps. The rifle features full-metal construction across the barrel, receiver and magazine, giving it an authentic weight and solid realism.

Designed with realism in mind, the rifle is field-strippable like the real M4, features an adjustable rear stock, and includes flip-up iron sights along with a Weaver/Picatinny rail for optics or accessories.

Key Features

• CO₂ powered semi-automatic BB air rifle

• Part of the Brothers in Arms® replica series

• Fires 4.5mm (.177) steel BBs

• Muzzle velocity up to 495 fps

• Full-metal barrel, receiver and magazine

• Realistic M4 carbine styling and handling

• Field-strippable design, just like the real rifle

• Adjustable rear stock with push-button release

• Flip-up front and rear iron sights

• 5.5” Weaver / Picatinny top rail

• Integrated sling swivel points

Specifications

• Calibre: 4.5mm (.177) Steel BB

• Action: Semi-Automatic

• Power Source: 12g CO₂ cartridge

• Magazine Capacity: 18 BBs

• Velocity: Up to 495 fps

• Construction: Full metal (barrel, receiver & mag)

• Sights: Flip-up iron sights

• Rail: Weaver / Picatinny

• Stock: Adjustable tactical rear stock