Andro Corp Industries 5.56 NATO 10.3" M-LOK Upper Receiver

A 10.3 inch barrel is where a lot of 5.56 builds land when the gun has to stay short without shrinking down to pistol barrel length, and that is what Andro Corp Industries put on this upper. The chamber is NATO spec, so 5.56 NATO and 223 Remington both run through it. The handguard carries M-LOK slots along its length for lights, grips and sling hardware. It pairs with any standard AR-15 lower, which makes it a straightforward way to change what a rifle does without buying another serialized firearm.