The newest addition to the Brothers in Arms line of semi-auto bb guns! This bad boy is sure to cause some chaos with its lightning fast shooting. With 4.5mm bb's, it packs a powerful punch. And what's more, it's a lot of fun to shoot! So if you're looking for a powerful and fast bb gun, the M4 is the perfect choice.
Use the included open flip-up sights or remove the rear sights to expose a 5.5” Weaver/Picatinny rail. Each of these airguns is field-strippable just like a real M4, and each includes integrated swivel studs for easy carrying options. Its adjustable rear stock can be set to your preferred pull with a press of a button.