Step 1: Turning a Blaster Into a Grenade Launcher
All you need is a blaster and a large stud.
And then just stick the small end of the stud onto the shaft of the blaster.
Step 2: Turning a Blaster Rifle Into a Sten
Simply just clip them together with the clip on brick on the side.
Step 3: Turning a Blaster Rifle Into a Sniper
And then just stick the connector on the rifle.