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to provide a fast, secure, and enjoyable experience. by Ernesto, from TX, United States Asked on December 20, 2021
The UTG Pro AR15 6-position Receiver Extension Tube will only include the tube itself. You do need a castle nut for installation but you can simply re-use your existing one. You can also buy this as a kit that includes the castle nut, receiver end plate, buffer, and spring, found using the following link:
https://www.opticsplanet.com/leapers-utg-pro-mil-spec-6-position-receiver-extension-tube-kit.html