The Delta Armory M4 M-LOK 13" ALPHA ETU AEG gets to be scrutinised by ASG Olsztyn. The ALPHA series is a full metal airsoft gun with a CNC Type A trigger, unique serial number, and 22mm RIS rails for attaching accessories. The stock is well-handled and battery insertion is convenient. The adjustable rear sight is mounted on a RIS rail and the barrel has a 14mm left-hand thread. The gun has a 13-inch (33cm) metal M-LOK handguard.