When you get an upgrade on the lawbringer for magazine, it doesn't change how many bullets fire with 'rapid fire' mode, the gun will shoot 'all' 6 bullets, when there may be 8 or more in the chamber, and then stop, you can't fire any more until you reload, you can fire normally but if you use rapid fire with more than 6 bullets in the chamber, it will only fire 6 bullets, and not the rest of them.
When you get an upgrade on the lawbringer for magazine, it doesn't change how many bullets fire with 'rapid fire' mode, the gun will shoot 'all' 6 bullets, when there may be 8 or more in the chamber, and then stop, you can't fire any more until you reload, you can fire normally but if you use rapid fire with more than 6 bullets in the chamber, it will only fire 6 bullets, and not the rest of them.