It doesn't matter. It is not a one time deal you can't easily change. If doesn't turn out how you like it, all ya have to do is take some 220 then 320 paper & take the browning off & redo it.
It takes aprox. 24 hrs to brown a barrel & all the parts & a few hrs. of presanding. So what. If ya don't like it, strip it & try another method.
Find someone with a glass bead blaster & you will have it to bare metal in 5 min.
Another option is to buy the small cheap Harbor Freight glass bead tabletop box & cut a hole in the door & put a piece of innertube over the hole, then cut a lil hole in the rubber & stick the barrel in thru the tight hole so it stretches the rubber tight over the barrel, then do 1/2 of the barrel, reverse the barrel & do the other half. Then make a small cover plate to bolt over the hole & use the innertube piece as a gasket to seal off the plate.
Now ya have a small glass bead machine that you will find yourself using LOTS of times & you also have a good excuse to buy it now.
If ya don't want to do testing on the barrel, do some test runs on a new piece of angle iron or some round stock. I have browned them smooth, rough, pitted, light brown, med. brown, dark brown, black, blueblack, etc. Play with it, redo it, try dif methods, etc. I have taken barrels that I have done 20 + years ago & just rebrwoned them because I wanted a different look.
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