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Faster Knife Attacks
Playing in third person, there is a limit to how fast you can swing small knives, like the scalpel or combat knife. However, if you enter first person, this delay time is non-existent, making combat far easier.
How to get a custom rifle
When you are in the castle in japan. After you have shut down all generators, go to the back of the castle. You have to walk on the right sid if you are facing the castle. There is a sniper who cant see you when you enter the hallway. If you have a smg (sd6) shoot him in the head. Has to be one shot. He will fall out of the window our at least his weapon will. The custom rifle sileneced sniper rifle. Then this might take a few tries. Luckily i got it on the first try. You must complete the level with this weapon in your possesion.