Does anyone here know what I'm referring to? If so, would you be able to help me figure out this intriguing puzzle? If no person knows what I refer to, I'll attempt my best a describing its...

That is how I started, however, I need a way to allign specific vertices at one point, since some have been misaligned.

I've been looking for a way to edit all vertices on one side of the model to move to one specific y-coordinate, is it possible without converting them all into objects?

No, the faces of the barrel are a selection shading option. The reference pictures are the profile shots from FN's site before it went under construction, so all proportions are perfect.

This is my model in the ready to texture stage. This is the low-poly version. Is it good, bad, could be improved? I modeled it using only polygons, I don't know about NURBs or SubDivs.

The mayares.dll file of my pc is corrupt. If anyone could send the file to me, I would be grateful.