Use stats on d20psfrd weapons page.
All Clockwork weapons are masterwork – IN THE WORKS
A Clockwork Stringer is essentially a more complex crossbow. It uses tension, springs, and pullies along with some cleaver gear-work to shoot smaller bolts with nearly the force of a traditional crossbow. However, the stinger can holds two bolts and can fire them in succession before reloading, or fire them both at the same target. The Stinger requires a full round action to reload.
Clockwork Stinger, Hand 1d4 19-20/x2 30 ft. 2 lbs. P
Clockwork Stinger, Light: 70 gp 1d8 per bolt 19-20/x2 80 ft. 8 lbs. P
Clockwork Stinger, Heavy: 100 gp 1d10 per bolt 19-20/x2 120 ft. 12 lbs. P