SIG ALUMINUM WING JOINER SET WITH PHENOLIC TUBE (SIGSH778)

This is the same wing joiner system used in the SIG "Somethin Extra". It is perfect for smaller .40 to .60 designs.
It allows secure wing panel mounting and easy removal.
The aluminum tube measures 7/8" O.D. x 15-1/4", while the female phenolic impregnated tube measures .880 I.D. x 16".