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The photos of the new gun are very good. The trigger pivot location is set back inside the handle frame and the piece that you squeeze with your trigger finger is a forward projection mounted on the front of the white trigger piece which is shown upside down in all these disassembly photos. The trigger pivot pin actually mounts in the rear metal section as you can see the hole for it, the other two holes at either end secure the plastic handle with transverse mounting pins.
Sorry Pete, I don't buy the "usual sinkers" argument here. You are, of course, right (as always) in that "metal guns" used to be sinkers. But LG designed this from the ground up and even made brand new hydroformed reservoirs for them. Should be easy enough to add a little extra volume in Solidworks/Autocad before you milled the molds.Guns with metal bulkheads are usually "sinkers", but can be made to float if the metal is machined away leaving essentially a shell where metal is present only where it is needed. An example is the "Taimen", in some places the metal is as thin as a razor blade. However the "LG" logo machined in the top of the rear handle body would appear to indicate some metal depth there, but a flotation element in the plastic handle may offset some of that weight. I guess we will know when the gun on order is inspected.