HD weapons for M1A1 have been worked on several times at the Pfhorums, but never completed, so good job at least completing a first iteration.
Some of the weapon graphics are too big and cover up the player's view, especially the napalm and the alien weapon. The pistols are too light of a shade of gray.
I would recommend opening a thread on the Pfhorums in the Projects section. It is a much better place to get feedback. When things are polished up, update this entry on Simplic7y.
This is my first plugin uploaded to this site, it adds hi-res weapon in hand graphics to replace the original, low-res sprites with redone 3d rendered sprites.
Constructive criticism/tips are very welcome.