Hi i'm a noob here but have a few Tac15i questions. First will any AR15 or M4 type aftermarket stock fit onto my Tac15i ? Does it use the same buffer tube setup as an AR-15 Second, My Tac15i strips fletches big time, virtually every shot. Does this mean it needs paper tuning or is there some other issue. Finally, does anyone recommend any mechanical broad-heads for this crossbow ? What about fixed two bladed broad-heads for dangerous game? Is there any chance they will shoot ok too ? Cheers..