An overview of the Valken SMG Magazine Adapter for ASL Series AEGs that is available at their online store and other Valken Airsoft resellers... "The Valken SMG Adapter for the Valken ASL Series AEG is constructed of durable hard polymer material and lightweight. This 6mm AEG magazine adapter fits any Valken ASL airsoft gun allowing the Valken submachine gun airsoft magazines to work inside a normal M4 airsoft rifle magazine well. Change your look from a normal M16/M4 style to an AR pistol with this adapter! We recommend our Valken SMG Hi-Cap and Mid-Cap airsoft magazines for use with this mag adapter."