a few months ago i bought an 870 express tactical (the one with the powder coated barrel and reciever and screw in choke). it is used primarily in a hd role, but may find its way into the trunk of my car or behind the seat of my truck from time to time. therefore, wheight and bulk need to be kept to a minimum, and durability to a maximum. i need some advise and direction on some mods. first, a light. i'm thinking the streamlight tlr-1. its light, mounts to a rail easily, and has a remote switch available for it. i just need a way to mount it. i was thinking of something that replaces the mag extension/ barrel brace with a short section of rail. the standard mount that pops up when i do a search looks a bit flimsy. any ideas? second, the front sight has been powdercoated along with the barrell and offers no contrast. i was thinking a fiber optic sight. how do i remove the old bead? most shotgun beads i have seen have a hex nut base that screws out. the one on my 870 doesn't. i added a pic so you would get the idea. third and finally, the recoil with 00 buck is managable, but cheek slap is knocking me sensless. i put a cheek pad on and that has mitigated the slap to tolerable levels, but it has raised my eye position to a point that i have to dope my poa at distance. is there a way to shim the stock to a lower position? i was thinking a sure shot stock, anyone tried one? thanks for the help.