Comes with 2 locking nuts. Can use end cap A8CAP, rubber end plug BP16, or fighting butts F2M, F2 and F5. Includes: 1 ea. threaded barrel, fixed hood and sliding hood. 2 ea. locking nut. Unassembled. Threaded Barrel O.D. - 0.750" Fixed Hood O.D. - 0.985" Length - 52.9mm (2.080") I.D. - 15.7mm (0.620") *Note item shown with insert