you can put fat tires and mags on a model t but it still won't be an indy car.
the lever action rifle was the first assault rifle, it is still as viable in its original form today as it was then. unfortunatly or fortunatly there have been improvment in firearms technology, better bullets, longer range shooting, semi and full auto rifles. folding butt stocks, fiberglass stocks, picatinny rails and hanging gadgets all over isn't going to turn it into an m4. john wayne didnt need lasers and refex sights, all he needed was a large loop lever.