newbie here, that is on my first go round for any build up ever so here goes. If I want to use a different recoil lug over the factory one do I have to have it machined(tapered)in order to drop it in a duramaxx stock and do I have to have some sort of pin placed through it to keep it in place with the receiver while I tighten the nut? Any recommendations on where to buy and which recoil lug to use?