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Why not just pick up an ICS MA-56 upper gear box package and not worrie about compatiblity issues.after all ICS made it to work with there product!I'v heard of some of the same issues,but I'v run my MA-56 for about two years in this state and with no problems and chron's at the 397 fps mark! I do run Systema hardend gears thow,hope it helps ya out,Cheers!
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