Originally Posted by super95six
I've recently bought a Gen3 Glock 21SF with the intention of building a 10mm long slide using a Lone Wolf G20L slide and 6.02" barrel.
Me too, except I ordered the G20LS slide, and have the 6.6" threaded barrel. The slide is on backorder (assuming yours is too?) but the barrel is here. The barrel is certainly not as high quality as the factory Glock barrel, or an EFK, KKM, etc, but is certainly useable. My LW barrel is a little rough on the inside, but a little lapping smoothed out most of that.
It does function 100% so far in the stock G21 slide (gasp!) and accuracy is great.