As a bare minimum? Take the number of magazines your vest/web gear can hold, add one (for the one in the rifle). So, if your vest holds 8, you'd want a bare minimum of 9 magazines.
A realistsic minimum is twice that number.
But having a number of magazines whose price equals the price of the rifle isn't a bad idea.
A realistsic minimum is twice that number.
But having a number of magazines whose price equals the price of the rifle isn't a bad idea.