1. A lot of people use real shotgun bandoleers. Some are velcro backed and you just attach the loop side of velcro to the shotgun.
2. Do not use .12's as they notoriously are made poorly and will break the gun's internals. Go buy .2g BB's at minimum. Higher FPS does not = greater distance / pain on the receiving end. At $10 a bag of 2000, BB's are cheap.
Ár skal rísa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.