I think they quit making those in the 1990s. I haven't seen any for sale in many years. I have (had?) a 6 K frame and a 6 N frame, but there were no 7 or 8 shot guns then.
I use a 40/10mm cal. stainless brush on a straight cleaning rod with a cordless drill. You could do all 7 chambers with that in less than a minute, and it would do a lot better job than an Allison brush.
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