If u have a B or A-B gun licence, you would most likely own a shotgun, the best recommended for this is a 12 gauge shell, (carefully with pliers or a blade) cut open the top of the shell, atleast 30 or so pellets will fall out so have a container under where you are opening it, when u have safely disposed of the remains of the shell, pick up 1-3 pellets, and push them though the hole, then hot gluing the orifice you pushed them through. these act as a very good weight for un-modded darts, creating improved accuracy between close and short range, also when you hit the target it will hit it alot harder.
Stefan mod:
before you create the top of the stefan dart, do a little bit, and push 2-3 pellets into the glue before you put the other amount of glue over that. and wallah! heavier, harder, more accurate stefans.
-Jack
post positive criticism please, no flaming.