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Another AR15 Scope Mount Question

Horse Plains Drifter
Well I got my Leupold one piece scope mount for my AR15. When I went to mount my scope, I discovered that the ring spacing is approximately .050" too wide to allow the scope to set in the ring mounts. So my question for bpost and others that have the Monstrum mount: Can anyone give me the outside to outside ring spacing of their mount? I am limited to a maximum no more than 4.675". The available 1" tube maximum spread on my scope is 4.700", and the Leupold mount measures 7.748" The scope is a Leupold Mark AR scope, P/N 115391 BTW

I talked to Leupold this morning, and their cure is two piece rings, which would be ok. I would prefer to stay with a one piece mount for alignment reasons although Leupold assured me that alignment of their two piece rings would be good. I paid $86.00 for the one piece mount, which I thought was pretty outrageous. Then when I looked up the ring set(P/N 57526) I see that they're $120.00-$128.00. That ain't gonna happen.

TIA for any thoughts/input.
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  • bpost
    The cantilevered Monstrum mount on my 5.56 AR measures 4.5" outside to outside of the rings, three screws per ring.  The mount on the 450BM is a three screw double ring mount.  Both rifles carry a Vortex 3X9-40 Crossfire scope.  There is ample room for scope eye relief movement.  Although the Monstrum mounds are china made they are pretty good mounts from the 25 or so I have installed on AR platforms.  They are also twenty bucks or so.... YMMV.
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  • chiefr
    bpost said:
    The cantilevered Monstrum mount on my 5.56 AR measures 4.5" outside to outside of the rings, three screws per ring.  The mount on the 450BM is a three screw double ring mount.  Both rifles carry a Vortex 3X9-40 Crossfire scope.  There is ample room for scope eye relief movement.  Although the Monstrum mounds are china made they are pretty good mounts from the 25 or so I have installed on AR platforms.  They are also twenty bucks or so.... YMMV.
    Same here with my Momstrums on 2 ARs, both wear Burris Scopes 1" diameter. Perfect fit and tight. Had to use Monstrum low riser to prevent interference with large bell on scope on one rifle. Next day delivery here on Amazon.
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  • bpost
    chiefr said:
    bpost said:
    The cantilevered Monstrum mount on my 5.56 AR measures 4.5" outside to outside of the rings, three screws per ring.  The mount on the 450BM is a three screw double ring mount.  Both rifles carry a Vortex 3X9-40 Crossfire scope.  There is ample room for scope eye relief movement.  Although the Monstrum mounds are china made they are pretty good mounts from the 25 or so I have installed on AR platforms.  They are also twenty bucks or so.... YMMV.
    Same here with my Momstrums on 2 ARs, both wear Burris Scopes 1" diameter. Perfect fit and tight. Had to use Monstrum low riser to prevent interference with large bell on scope on one rifle. Next day delivery here on Amazon.

    Thanks for adding the riser part.  My 450BM AR has the low risers on the scope mounts to clear the objective bell and barrel.
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  • Horse Plains Drifter
    Thanks guys, I have a Monstrum mount with a 4.5" outside ring spacing on the way.
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