Not sure about specific length, but FAC has extended and threaded or extended and ported barrels for many common pistols. If you got a threaded extended one, you could possibly make a slide flush extension on which to mount a site farther forward, or have one made. I've seen such things on 1911s and Hi-Powers.
My concern is if it will pass WI 5.5" barrel law for deer hunting. Rather use a pistol to put a deer down than finish it off with a .300win at close range. I cant just watch it die slowly. Rather make it quick.
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