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This kit includes 0.685, 0.689, and 0.693 backs, and a 10" barrel tip. The tip is both Apex and Apex 2 ready. This black dust kit works with the Angel A1, A1 Fly, A1 Fly SE, AR:K, and SB. The existing barrel tips from A1/A1 Fly and SB will work with these backs. As an example, if you have an A1 Fly with a carbon fiber tip, you can use it with these backs.