i am making this 2 shot gun. well, its pretty much done except forthe handle and the finish. it is 58 " long at the moment,(i may cut off a couple inches. or i may put lead behind rear trigger, we'll see how it floats) so 58" overall, top track is 50" bottom track is 41" both are 9/32" bored with my new custom bit. leaving 3/16 on top of track is open for shark fins. instead of 1/4" i WAS leaving with the neptonics bit. i made two band slots since the gun is so tall. the gun is 2" tall x 1 1/2" wide. i will make the top spear a line shaft and the bottom will be freeshaft. both will have 2 5/8" bands. i poured bith bottom and top tracks with graphite. also the area where the trigger rod slides is also graphite. this was complicated router work. not too much worse than a regular gun. but the line anchor was a dilemna. i put it on the side like big daddy spearguns does.