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Kevin, no Sir. 11 Nipple only for proper function. Some owner details here : https://www.muzzleloadingforum.com/threads/naa-companion-cap-question.131369/ --- Cheers and stay safe!

Kevin, unfortunately no, from what I'm reading you can't change to a number 10 nipple. You can contact North American Arms and double check at 800-821-5783 or email them at ( customerservice@northamericanarms.com ). Sorry but hope this helps.