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The purpose of this device is to provide additional padding between the typically hard buttstock surface and the user 's shoulder , to reduce the amount of felt recoil of the firearm and to prevent slippage on the shooters clothing while aiming .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None