Spent about two hours fiddling with my new Diana Trail scout co2 air rifle. First off I loaded three carts and used an Allen wrench to fully tighten the end cap. Pulled the charging level and went on to shoot. After about 15 or 20 pellets it gave out by shooting very low. Removed the end cap and looked at the three carts and in bright light couldn't tell which cart had been penetrated. So placed a dime behind the last cart and repeated. Long story short only cart was active. Ending up using three pennies behind the last cart to get all three to function. And working the lever wasn't easy. Earlier I tried two cents and dime and only two were activated. Hope that all are not like mine. Only good point in the process the gun was a very accurate shooter. Charles