I bought the kit from Sams that has the variable speed with the flexible shaft and the rechargeable unit, plus a bunch of attachments for $89.95.
I use the felt wheel attachment with Simichrome to polish trigger assemblies and feed ramps on my Glocks. Also have used the drum sander for free-floating a couple of rifle stocks.
I don't do any metal grinding with my Dremels, but then, I have Glocks and probably will never need to do any grinding.
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