Our Tuna Speargun Trigger Mechanism is awesome! The housing is still machined out of solid stainless steel and fully rounded ends make it a breeze to install. Internal components have a new geometry for an even nicer, smoother release, strength, and durability. It accepts shaft sizes: 9/32, 5/16, 11/32, and 3/8 with the dimensions of 1"H x 3"L x 0.5"W. All of the mounting hardware, including stainless steel pins and line release is included with this trigger mech. For the easiest installation, be sure to get the Installation Jig for this trigger mech. The tuna trigger mechanism is used by the top speargun builders. This is hands down the sturdiest trigger mechanism on the market. It is the best option available for big bluewater spearguns. This particular trigger mechanism has resulted in uncountable numbers of large fish being harvested all over the world. If you are looking to use a trigger mech that can handle more pressure than the back of your spear shaft your search should stop here. The Tuna Mech can handle in excess of 1,400 pounds of force. The Mech's tight tolerances guarantee accurate release as long as the mech is installed correctly.

• 100% Solid Stainless Steel


• Fully rounded ends make it easy to install without having to square the trigger pocket


• Holds up to six powerbands with ease.


• Accepts all standard shaft sizes including9/32, 5/16, 11/32 & 3/8


• Dimensions of 1"H x 3"L x 0.5"W