I'm no gun builder but I love roller guns so much, I enlisted the help of Bubba and Ken H to help me build my second roller. My first was a single action 48" roller that I made from a cut down Deathstick.
This is a custom enclosed track 57" double action roller, Wong/Aimrite trigger mech, Deathgrip handle, RA reel, Neptonics line hardware.
It shoots like a laser with almost zero recoil. I made 2 -19" bands tied in with 2 wishbones. I can't load it to the third bottom loading tab, so I'm going to make some longer bands.
Here are the pics: