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Old 06-16-2015, 01:29 AM
  #52  
Ex_Pat_Tanker
 
Join Date: Mar 2008
Location: Peterborough, UNITED KINGDOM
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Assuming that was aimed at me, yes you are correct. The M51 has a bigger turret ring gear (and upper hull) to allow the recoil unit to drop thru when the gun is elevated, with the normal M4 ring gear (and the HL turret ring) the recoil unit fouls it.

The downside of doing this is that you maybe loose a bit of elevation movement.
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