Let's compare.
MKb42 VS AK47
MKb has 15% less vertical recoil (425 v 500)
MKb has 10% less horizontal recoil (225 v 250)
MKb recoils straight upward on average, AK veers rightward.
MKb has 40% less spread (0.009 vs 0.015)
MKb has higher priority (have both, hit '3,' and it's higher on the list)
MKb has a steadier animation for holding iron sights up (doesn't move one pixel, AK wobbles a tiny bit)
MKb has a pointier front sight
AK is 9% slower cycling (0.1 v 0.109)
Tied damage, mag cap, reload time, ammo cost, ammo reserve
MKb costs 10% more (1100 v 1000, to 330 v 300)
AK47 is the spawn weapon for 6*
I'd call this one a solid win for the Nazis. It's good that the AK is the 6* spawn weapon, because otherwise it'd be made entirely obsolete, bar a tiny bit of dosh saving.
Now let's pit two American arms against each other!
Tommy VS M4
M4 is 12.5% less powerful (40 v 35)
T is 10% cheaper (900 v 1000)
M4 is <1% slower to reload (3.6 v 3.6333)
M4 is 20% heavier (5 v 6)
T has 40% less vertical recoil (150 v 250)
Tied mag cap, ammo costs, horizontal recoil, and sight animation stability
M4 has higher priority
T is 14% slower cycling (0.0857 v 0.075)
T has 25% less ammo (300 v 400)
T has 50% more spread (0.012 v 0.008)
This one is way more disputable, but I personally prefer the Thompson.
Discuss, and let me know what I got wrong, or left out.