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To get the c96 you must complete extra ops 20 with an s rank
To get the m134 you must complete extra ops 75 with an s rank.
The M4 Carbine is not a weapon that appears in Metal Gear Solid: Peace Walker. The only games in the Metal Gear series which feature the M4 are Metal Gear Solid 2: Sons of Liberty and Metal Gear Solid 4: Guns of the Patriots. However, Peace Walker does feature the Colt Model 653, also known as the Colt Commando, a precursor to the M4, which would enter service in 1994. To obtain the M653, you must first have a Rank 2 M16A1. You must then complete Extra Ops 59, the design specs will be located at the south edge of the map.
To unlock extra classes you must prestige. In order to prestige, you need to level up 50 times and press "Prestige Mode" in player card. When u prestige once u unlock one extra class and prestige thrice (3times) u unlock another and prestige 5-7-9 and so on until all r unlock
You can either play a lot and hope you get lucky. Or you can craft extra dropped weapons into hats.