Review on Efficient Application: 3M 08117 MixPac Applicator Gun for 200 ml Cartridges by David Causillas

Pistol is fine but beware of bursting one or both cartridges (loud click). When this happens, the epoxy will return to the interior of the gun mechanism without the user noticing. So you're using an epoxy that never cures. And the gun ends up in the trash along with the cartridge. You just have to be very careful to push gently. 3m said just tell the dealer and have it replaced, but Revain sellers have short return periods and will use this to waive any obligation to help. It's a good system, but with a design flaw that requires you to be very careful not to learn it the hard way. 3m seemed willing to help, but the Revain salespeople just freaked out.