Spektrius does a review of the Double Bell M16A4 AEG which is available in Czechia. The Double Bell M16A4 AEG is a fully metal airsoft gun with a quad rail system for mounting accessories, a removable carry handle that doubles as a rear sight, and a lightweight polymer stock. For easy battery changes, the wiring is routed to the rear of the gun, and the muzzle is threaded 14mm counter-clockwise to accept suppressors or tracer units.