There IS just as much net recoil force, since that is strictly determined by the physics of the number of bullets, their individual masses, and their speed.
What DOES happen is that there are many, many "hundred" bullets released from the barrels BEFORE the recoil (of the first few dozen bullets) jerks the barrel enough to disturb the aim.
Of course, once those first few hundred get shot somewhat accurately ----- THEN the recoil of the next few hundred throws the gun all over hell and creation........
Exactly right. Why not just use a frangible metal in front of an explosive charge? Oh wait, that's called a land mind. LOL!