Specna Arms M4/M16 buffer tube, threaded

Metal buffer tube / buttstock for M4/M16/AR15 airsoft electric guns. Attaches by screwing into the lower frame of the gun with threads and tightens in a suitable position with a separate tightening ring. The gun frame must therefore have threads for the buffer tube. If the frame has a protruding part where the tube attaches, you need a different type of buffer.