Made famous by their roles in war films, the M4 series rifles date back to the Vietnam War era. At Just BB Guns, our M4 Micro SD Airsoft Guns offer a smaller scale. Despite their relatively diminished size, these BB Guns are partially constructed from metal and so are both surprisingly durable and very practical. Their time-worn design also means they are perfect for the modern airsoft battlefield. If you have any questions about our M4 Micro SD Guns, feel free to contact our expert Just BB Gun staff via our website. Alternatively, take a look at our extensive blog posts.