SA-B12 by Specna Arms was mostly made from an alloy of zinc and aluminum with several steel elements placed in the most troublesome spots of the replica (pins, screws and tactical sling swivels). The SF type stock, which stores a battery, as well as the pistol grip were made from polymer. The body of the replica has undergone a process of anodizing, which guarantees a high level of protection against corrosion. The paint job was conducted by powder coating, after the surface has been sandblasted beforehand. Such a way of applying the paint provides a higher than usual paint resistance against abrasion. The body bears USMC markings.

All parts of the replica fit very well together – a standard so high that so far it could only be observed solely in replicas from such well-known brands as G&P or Classic Army – and it is exceptionally well balanced. All that makes this replica highly maneuverable and its weight is practically imperceptible when put against the shoulder.