1. Join a hardcore or regular server after updating to .45 stable.
2. Upon entering the game, a "player hurt" sound may or may not play, followed by a red tint on screen for a split second.
3. Aim down iron sights of an AKM, M4, Mosin or Sporter rifle etc and experience heavy horizontal jitter.
4. Use morphine or crafted splint on self to alleviate the issue.