Hacksawed to length.
Faced the muzzle to 90 degrees (flat) with the Brownell's facing tool (bought from CNC Warrior, bore pilot from Dinzag, drill adapter from Brownell's, using copious amounts of cutting oil and frequently stopping to reapply oil and clean up shavings).
Crowned with Brownell's 11 degree crowning tool (used exactly like the facing tool).
Finished off with some fine grit sanding (finger on sandpaper, worked in a small circle on the freshly cut muzzle).
Blued the end.
That's it. I could have gone a few extra steps with steel wool and such (as illustrated on Dinzag's site), but the crowning came out pretty good. I'd never done it before, although I did practice on the cut end of the barrel portion I cut off.
I bought the tools because I also have an SLR-104UR that I expect to receive an approved stamp for next weekish.
If you're going to do it, go slow, be careful, and it'll turn out fine.
I took it out to the desert to function check it today, ran a few magazines through it, walking up on the target as I shot to get varying distances to check for any keyholing, everything worked perfectly.