tube

This is driving me crazy. I bought a used BR700 and it only has the upper parts of the tube up to and including the handle/trigger. Nothing beyond that. I have found online diagrams galore but they don't show me what part numbers I need or I am too stupid to figure it out. It's not the coupler...

The impulse grommet on my Rancher 55 is worn beyond use. I live in Chile and the local dealer does not have the part unless I also buy a new cylinder (at a ridiculously high price). A new one from the States costs about $7, but the shipping is about $35 and import duties add some more. I can...