Haven't seen these here yet. Just passing on the link. Can never have too many of these!
I personally use these, but never see them for sale. At 15 cents a piece there is no reason to not have one on your barrel.
This is the only option that I've seen that protects the end of the barrel and keeps crap out.
http://dsgarms.com/index.cfm?fuseact...Product_ID=131
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