No. The ability to manufacture precise metal parts didn't exist then. Parts similar enough to be swapped (interchangeable parts) were developed in the 18th century. Modern machine tools date from a similar era. So do modern measurement techniques, like calipers--measurement tools precise enough for modern machines, such as the vernier caliper, hadn't been invented yet.
Do you have any info about how assault rifles are made? I could go into more detail about what processes are required that didn't exist then.