I'm thinking of trading in my 11-87 supermag for an fnp-9. one of my local gun shops will give me the handgun, 3 16 rnd mags a holster and probably a few boxes of ammunition for the shotgun straight up. is this a good deal?? i only paid 300 for the shotgun and it has about 5 boxes of shells thru it. got it off a duck hunting acquaintance that got laid off and needed money fast.