Your final question about a poor man's hunting rifle or a collector's piece is up to you. I would think this is a MkVI ammo rifle and may be rebarreled at some point to handle MkVII but I would determine that first. Metford 7 groove rifling or Enfield 5 groove is another determination. Gauge the muzzle may be a good sign for wear but I learned just the other day that some Mk1 barrels were reverse tapered after the first 10 inches of bullet travel down the barrel. So a gauging of the muzzle may produced false results. Myself, if I wanted a hunting rifle, there are many sportered No.4s out there which are better equipped for a hunting/truck rifle. I personally would want this for a collectors rifle and load up MkVI equivilent ammo to putz around with it at the range but that is just my opinion. Others will vary! Stock parts will be hard to find but not impossible. What you could do that seems to be fairly popular is to make up a Lee Speed copy of the same era BSA sporting rifle. You have all of the basic parts ready to go.
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