Killerk,s Magnum is a great gun but unless you have a grey cap on the end of the piece that you are trying to fire it will fall inside the gun ,or with a cap it will fall out of the end of the gun ,with this mod you can fire knex pieces with out any mods on the projectile.

Step 1: These Are the Parts You Will Need .

Step 2: Connecting Holders

connect the black stub to the white rod.

Step 3: Putting Secondary Holders On

1 magnum with out 1st or 2cnd holders
2 Make this
3 Squeeze it together
4 attach it like so

Step 4: Making the Piece That Holds Your Projectile

1 get as many small ruberbands as you think will need (you can adjust it later)
2 rap them round the black piece so that you get a flat area for the projectile to hold onto
3 place it here it will not click just sit there

Step 5: Connecting 1st Holders

1 connect the white rods to the place shown
2 turn the rods in to hold the black connector
3 here is a movie of how it does not fall out (my editing software is not working so i could not edit it)