
Originally Posted by
Iraqgunz
Per a thread elsewhere from Joe Marler who is here as well.
The old MFR Rail had it's own very unique barrel nut that wasn't usable for any other rail system.
Current Rail systems (DDM4 Rail, SLiM Rail, RIS II, and soon to be MFR XS) will all use the same barrel nut. The DDM4 Rail and SLiM Rail acutally share the same Bolt-Up Plate which makes going from one to the other very easy. The RIS II and MFR XS will have their own Bolt Up Plates. Long Story Short, if anyone has a DDM4 Rail Or SLiM rail and wants to put the new MFR XS on their rifle, it's going to require removing everything from the barrel in order to install the new mounting hardware.
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