Hi Catsmom....Bert's surely got the right approach here!
Here's the description of how to do it from Peter Hart's walkthrough:
WARNING SPOILER:
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Then click on your case file, and click on and study the different aspects of it. Remember you can slide certain pages up & down. Next, examine your revolver; notice when you put the cursor over the butt/handle of the gun, it turns into the pointing arrow. Click here - HOLD - and pull forward to the barrel of the gun. ..
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Love, Witchen =O)