Well. If you have to retopo a gun cylinders probably you will need a bridge to conect both sides. Creating faces would be almost imposible as all cylincers are inside another big one. Also would be a great implement if the bridge has a segment count to divide along the bridged area.
I guess again Maya is what i need here. I miss the bridge in retopo room but i miss even more to have a box modeling room with most common operators such as bridge, bevel, extrude.. and so on.
Thanks for the replys