NICELY DONE MY MAN,
Lovely gun you have here, beautiful details beautiful functionality.
Really reminds me of the days when I first started making gun figures.

Here are my tips though
Fix the main node and 2nd node placement( look at my guns)

Remove the outlines and it’s REALISTICK™

For better optimization, remove some of the side rails on the barrel.Remove the attachment nodes as well, 95% of the gun attachments on sticknodes are build to attach on the secondary node (check my red dot sights pack and explosive bullets gun attachments pack)

The gradients are too bright, tone them down a bit

Fix the magazine, feel free to use my optimized m4a1 magazine or explosive bullets original unoptimized m4a1 magazine.

Add gradients to the hand grip.

Fix the node placement of the magazine node, it goes crazy if you move it.

OVERALL VERY EPICO GUN 10/10 STARS I am rarely impressed but you my man, have potential, you can become the next explosive bullets. Keep it up and take into account my comments.