No Longer Available
Buy a Lone Wolf slide and get a free Lone Wolf barrel. The only bad thing is that they don't have 6" barrels listed for their 6" long slides, so you will get a shorter barrel if you want a long slide. They still have plenty of G20 and G21 slides. The smaller frame slides are all sold out. If you want to convert your G20 to a G21, this is a good opportunity.
http://www.lonewolfdist.com/Content.aspx?PAGE=Black%20Friday
I got a Solid G20 Long Slide with a threaded tactical length (5") barrel (that I will most likely sell so I can buy a 6" barrel), and a Solid G21 Long Slide with a 9" 45ACP barrel (I figure I can always cut it down to 6" latter).
P.S. The slides are bare. You will either need to buy the internal parts kits (~$100+), or remove the parts from your slide and put them in the Lone Wolf slide.
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Also includes FREE shipping on all order until Nov 29 @ 8am