Compared to a normal SNAP, it's pretty tiny.
I didn't bother with a handle, deciding that a "hand cannon" sort of firing method would work better for this gun's intended purpose (holdout type of thing). It ain't no primary.
The plunger is sort of a cross of my compact plunger head (which uses compression nuts) and the type of plunger that davidbowie used in his Snapper series of guns.
You hold down the trigger until it's cocked, then release. The middle washer is held in place by the nail. The back washer is the spring stop (compression nuts aren't strong enough to resist a spring). The lead washer is the seal backer.
I used a bit of FBR inside the 1st to 2nd washer to keep it centered.
Yes, it's a little heavy. I was just getting it built without much thought to weight. Couple that with the somewhat weak spring I had available, and the ranges aren't all that (~20-~30 feet). But it's worth working on some more.
Things to improve:
See if I could use the seal backer as the nail catch, so I could eliminate one washer and the spacer.
Get a heavier spring.