its a start. Hard to coment at a stage like this. One thing I did notice though is you have no edges going to what I belive is the thumb hole there. This could make it nearly inposible to work with there, make changes etc. As the hole is lost in the one big face that acualay serounds it. On your triger hole you have a edge going to it.. If you redo that spot I would sugest befor makeing the hole to have a edge going acrost there to split the face up in to 2 to give that hole something to bit in to sorta speek.
Are you working from a refence image? The stock looks a little out of proportion and you could divide some of the heighten areas better. I know its a wip and it's early in the progress so It's hard to give much criique yet. You do appear to have a problem in the barrel though, as some faces aren't appearing?
I have made many guns in my day, and Id suggest you rethink how you are doing this. You should start with a cube, and then start extruding outward along the shape of the reference. What you are doing now is leaving a bunch of edges that dont meet. If you plan on ever using this in a game, you are gonna be in a bit of trouble.
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