A buffer tube made of metal for AR15 replicas. The buffer tube is adapted for use with ESA™ quick spring change system. 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.