I think the M4 is more worth the money you pay for it. If I were to have a pump that was modded by a gunsmith I would choose Vang Comp. All Wilson does is coat the gun and bolt stuff on. The shell holders they use are crap. Mesa Tactical is in a different league IMO. If you want a pump, a stock 870 police would serve you just as well (because they are basically the same) and you can buy alot more accessories and ammo for it.