I got the 870 base model synth stock. I'm about to go searching around for the deer barrel w the cantilever.. But I'm considering mounting a rail on the rcvr to get an optic in there for other hunting (turkey etc...).. So both questions.. 1. Would the cantilever interfere w the rcvr rail? 2. With no predrilled screws in there would that be a dyi or better off sending it to a pro?