Posted: 3/9/2010 11:05:43 AM EDT
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Ok, out of the lurkness:
The LT111 mount that comes w/ the OBR has horizontal-split rings as opposed to vertical as found on most other Larue mounts; SPR, etc. I presume the deviation was a result of trying to keep things as low as possible over the 20MOA tail, but I digress and am probably wrong anyway. When tightening down the rings in an X-pattern, I can't seem to prevent the scope from rotating just a tiny bit at the end. I know the vertical ring mounts are recommended to have the lower half tightened first and then the top, but I don't know if this applies on horizontal iterations - the ring halves are designed to have a gap, so torquing one side first to any measurable amount would really make things crooked. For reference, I'm working (carefully) from a bipod wrenched down as tight as possible, using a FAT wrench and a Starrett pocket level. ANY IDEAS? I thought about trying to loosely shim one side to match the finished gap and then tighten down but that is probably making things way too complicated 
And yes, I have an OBR, of which I will happily post pics for anyone interested as soon as she's got glass sitting square on top... Ok, that's #1... |
| I put both ring half's together and then spin the four screws down with the proper fitting bit, wrench, etc. using just fingers. Then I tighten one side a half turn on both screws, then the other side a half turn, and keep up till tight (with index and thumb on the short side of allen wrench for example) I just eyeball the gap between ring half's. Good luck on the vertical! |
| Get a set of feeler gauges. Get the correct combo stacked up between the flat part of the base, and the flat part on the bottom of the scope. Tighten the screws, and remove the shims. Be careful, as you tighten, it might also tighten the shims in place so you may want to go a few thou undersize. I wouldn't trust this method of leveling to many bases, but I trust the squareness of LT stuff! |