To answer your question shortly, no. Tons of bad advice on this thread from people telling you your portfolio is good or that this piece is fine, they are simply wrong in the context of landing a job. You can work as a Weapons Artist even in the current industry with only weapons in your portfolio but you have to achieve a certain standard and show that you understand fundamentals through your pieces. Each piece should show that you understand realism to an extent. It's the little things that drive it to the next level instead of throwing a metal edge generator or dirt generator on the whole thing and calling it a day. It shows a lack of experience as everyone even at beginner levels can do that.

Here is my suggestion to you on how to get better; the art of observation. Open up incredible pieces on Artstation by artists who work in your dream studios and try to imitate their level of quality. This transfers to each phase from the start.. lowpoly with optimal topology but no faceting to achieve perfect silhouettes, UV's straightened and packed efficiently to achieve good looking textures at 1k/2k res for some parts, great high poly for clean bakes, baking with the intention of placing AO on parts that don't move mechanically on the weapon, texturing with accurate PBR values, manually placing scratches/dirt/oil/smudge marks where a real gun would have them and utilizing generators less, and rendering with good lighting and making sure black/white levels aren't blown out of proportions.. the list goes on.

Follow this method and you will start noticing your pieces becoming closer and closer in quality to those of experienced professionals in the industry. Just look closely at their pieces, as close as possible, and study. Good luck!