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This is a guide for the only part of the Birdie's Gift Mission in Hitman: Absolution called the Gun Shop. In it you sneak around the gun shop to recover the Silverballers without competing in the target shooting. Alternatively you can compete in it, but it is more difficult to do. This guide explains how to complete this mission on the hardest, purist, difficulty. It does not explain how to complete the different challenges in this area.
At the start make your way to the back of the store and locate the electricity box. Wait for the guy in the army shirt to have walked past you.
Then sabotage the electricity box. Go back to the counter that is now deserted by the staff and go behind it and pick up the key card. This area has another exit with swinging doors. Go through them and go to the back of the storage area. On the right wall is a door leading to the target range. Go out of it and go left. Follow the trench until you find a branch to the right which leads to a bunker. Go into the bunker using the key card from earlier. Be sure to recover the evidence on the shelf ahead.
Also pick up the notebook next to the computer screen to the right. Go back out of the bunker and follow the trench back. Be sure to pick up the metal pipe on the way back. When you get to the front of the target range follow the wall all the way to the left, but not quite to the edge. Throw the metal pipe you just picked up either in front or behind the guard standing in front of the door to the gun store.
If you threw the metal pipe in front of him wait for the guard to turn around and go back to his position after investigating then change cover. If you threw the metal pipe behind him change cover as soon as he turned his back towards you. Leave cover once you are on the other side and go a bit further left and then climb through the window. In that room is a safe which you can just open since you fund the notebook earlier containing the combination of that safe. Inside the safe is the key to the case of the Silverballers. Behind you is an air ventilation shaft.
Go through it and you are back in the main store area where you don't have to hide from everybody. Go back to the counters to the case of the Silverballers and open the case. Once you have the Silverballers back you can exit the store and once you have it is the end of this mission.