On the 20th, Valve made an update to Team Fortress 2 about the rate and occurrence of weapon drops. Straight from Valve's official Team Fortress 2 website. The changes are laid out below,

• Previously, we rolled randomly at intervals to see if you got an item drop. Now we roll to determine when your next item drop will occur. So you're guaranteed to find items at fairly regular intervals. The bulk of drop complaints we've received in the past have been from players having unlucky streaks, wh...

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