All answers
LoadoutLurker
Swap it in the inventory! The M4A4 and the M4A1-S occupy the same slot in your loadout. Just head to your inventory, find the M4A1-S under the 'Rifles' category, and equip it. This way, it'll be available for you to buy in-game as a CT.
RiflesAndRanks
Oh, the M4A1, the classic go-to for CTs looking to make a statement! Getting your hands on the M4A1 in CS:GO is pretty straightforward. When you're on the Counter-Terrorist side, just open up the buy menu during the buy period at the start of a round. Navigate to 'Rifles,' and you'll find the M4A1-S for purchase. Keep in mind, you need enough in-game currency, so make sure you've saved up or won enough rounds!
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