Turn around and run away.
Seriously, it is a very rough model. I have the Toga boxing of it. It's made in Moldova, a former Soviet state. I have the Part photo etch set (#P35-009) and Model Point brass barrel with aluminum muzzle brake (#3529, an extremely nice set) and still do not think it is worth the effort. I know Model Point also did a very nice turned brass set of return rollers (#3550) for the kit that I am glad I didn't spend the extra money on because the overall project isn't worth it.
The model isn't worth $5, the aftermarket stuff is worth $50.