It also doesn't help that Russia's best manufacturing centers were in the far west. When the Nazis invaded their best, high tech manufacturing was wiped out pretty fast. They had a competent semi-auto rifle which was cut off from production in 1940. A big reason you have the image of poor Soviet equipment and the reason for the lend-lease was they had to literally rebuild an entire manufacturing center from scratch at the beginning of the war. What they had was gone.