How about a set of quadruplets and a set of triplets...lol.
The quads are 4 Webley Valuemax .20 caliber break barrels, one of which is still new in the box.
The triplets are 3 Webley Tomahawk .22 caliber break barrels. The middle and bottom are 1 and 2 (the top 1 is a .177), the 3rd is gently used, less than a tin of pellets through it and also in it's original factory box.