Picked this up a while back, and never gave it any thought. I never got into Enfield's but the condition on this one was to nice to pass up, picked it up for the price of a refurbished Mosin. Not sure what I have here, I know it's a BSA, matching numbers, and the guy I got it from said it was a commercial gun, and what is the brass disc ? It does have the British Crown Proof. What model, make do I have, and is it a military or commercial ? World War I or World War II ? Thanks for any info, not a Enfield guy.