The commas, so many commas.
As for "adding detail", I see that you have for some inexplicable reason enlarged the bolt handle and modified the rear sight hinge pin on the M1903, and have changed the rear locking lug shape on the 03A3.
I am not sure why these changes were necessary so I must ask if you took measurements from a real rifle in order to do them.
I didn't change that stuff at all, to my knowledge, and the bolt handle is from the Mauser and the same size, some M1903s had that type.