Hia lads, just put a deposit on a shotgun so am going to sell an old BSA air sporter that I have been keeping in my cabinet, I have done all the internal tuning, will have to do some cosmetic external stuff before it goes though, it is putting out a consistent 10.58 ft/lbs I don't know if this is good for an airsporter but seems good! my main questions are, what Mk is it? it says gl12901 on the bottom... if this helps, the other question is "would it be worth buying some original open sights? as when I got it they were soldered on and crappy so I took them off... will it bring the value up or