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What cutout are you referring to? The one on the left side of the MP5 A3 stock? I think that's only required for the .40 S&W and 10mm because of the boltcatch. If that's the cutout you are referring to, then no, it isn't necessary on the 53.
 

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Discussion Starter #3
What cutout are you referring to? The one on the left side of the MP5 A3 stock? I think that's only required for the .40 S&W and 10mm because of the boltcatch. If that's the cutout you are referring to, then no, it isn't necessary on the 53.
Thanks.
 
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