Better check a little further first. I believe the minimum barrel length for rifles is the 16" no problem, but for shotguns it is 18", so I don't think I'd put a shoulder stock on that 16 1/4" with the choke out. Just off the top of my head, but I don't remember the last time my memory served me well either. :wink:
BTW, my current Contender .410 is a VR 21". I had a 10" 45/410 a very long time ago - was worthless for the 45 Colt and marginal at best for the 410. Damned mourning doves just laughed at me (but some buzztails and cottontails that got real close didn't).
FWIW