Thank you, Lorne. I have talked with Track of the Wolf about possible replacement nipples and just about everything else I need! They only set up to produce nipples periodically. Next time they plan to do that is likely 4 months or so away. After talking with them I don't think they have any nipples in stock that would fit so I have to wait. The original nipples are very clean and work fine with the #11 caps. I see now that GunBroker is a possible source for #11 caps and #11 'mag' caps. The regular #11s work fine so I don't see any reason to get the 'mags'. Your help is much appreciated.