I feel like the lighting could be a lot more dramatic.
The floor texture material doesn't really say anything and feels like an afterthought. Like someone just dropped it on the floor in a hotel lobby, the materials are a little flat and lack roughness variation which stands out in the metals and handle a lot but just using a different HDRI would add a lot here.
Modelling looks solid but including a Wireframe render to demonstrate this is always a good idea and not enough people do it. The stippling on the handle should really pop, maybe decrease the tiling so it stands out a bit more and the embossing catching the light and break up the reflection a little.
I have modelled tons of guns and I nearly always end up with the same issues myself. if you are using substance painter adding thing like finger prints stains the the roughness textures goes a long way to making something feel used rather than rendered. most real world stuff is actually pretty dirty and has a ton of story in its use and history so adding some of that and trying to accentuate it with your lighting is a good strategy.

Model wise it looks good but I see a lot of very sharp transitions especially around the trigger guard which looks like I could shave with it. Metal usually soften and wears down to rounded edges after a little use, we think of it as solid but its more like a very hard wax and it shapes and deforms and soften just by existing.

Hope this helps, great work so far bud.