You can bypass ranks using Credits , but the cost is steep. Buying every weapon from Rank 0 would cost over 2.8 million Credits , or roughly $2,360 USD in Robux.

If you're aiming for a "natural" unlock-all, efficiency is the only way to shorten the hundreds of hours required:

Unlocking every weapon in is less about a "glitch" and more about a long-term psychological grind. With nearly 200 primary weapons currently in the game, reaching the final naturally unlocked gun—the M231 at Rank 123 —is a journey that defines the player's experience. The Philosophy of the Grind