14 Teeth Piston for AR15 Specna Arms Edge™ Replicas Original Spare Parts offer of products includes a wide variety of both internal and external spare parts for Specna Arms replicas. They are exactly the same high-quality parts as the ones used in the production of serial Specna Arms replicas. Original Spare Parts products are useful to owners and users of Specna Arms replicas as well as repairmen. A high-quality piston made of durable polymer and steel with a full 14-teeth jaw. The piston is intended for the installation in M4 / M16 replicas, however, it will also ideally fit Specna Arms EDGE replicas.