Devastátor grenade launcher remix

Remix of the Devastátor grenade launcher - https://www.thingiverse.com/thing:3536210

Changes to the original.
1. Split pistol grip into three parts so that the launcher can actually be assembled.
2. Added trigger guard.
3. made the trigger shorter to accommodate trigger guard.
4. Made firing pin smaller. (Necessary to make strong grip frame that has been split into three.)
5. Made a notch on one corner of the firing pin block so that it is actually possible to insert it into place.
6. Made a notch in the barrel so that it does not grind against the pistol frame when pivoting.
7. Made several versions of the barrel. (NOTE: only the original hexagonal version is tested.)

What's needed to complete build.
4x #4-40 screws 1.5" long
1x #4-40 screw 1" long
5x #4-40 hex nuts

1x 3/16"" metal rod about 1.25" long for trigger
2x springs from retractable ball point pen (clicky-clicky)

Delrin or nylon rod 6.5mm dia. 20mm long for barrel pivot joint.
2 #6-32 by 1/2 inch long.