Doc, I already own a detachable 9mm can from an HK-94 converted by Ceiner into an MP5SD. I've been in contact with a guy over at HKPro.com who built his own 53SD, so maybe that project will pan out. From there, it would be relatively simple (I hope) to convert to .300 Whisper and then to expiriment with the right load for the round.
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