[quote="Cthulhu"]There are two good ways to do this, but both need a lot of barrel modification. The first way is to put a small dent in the barrel (very very small) that when the ball is rolled down it has enough force to pass it but not enough to fall out again until shot. The other way is to make...

hello guys this is my first attempt to make a marble gun here's my only problem now my only problem now is how to make marble not fall in barrel? I know this gun because alot of people in province makes this gun to shot birds. but they build a better one which is a sniper rifle, What i cant figure o...