External Adjusting Rings and Rails for Ultra-Long-Range Shooting
Stephen Ivey has engineered an interesting set of gimbaled scope rings allowing up to 150 Minutes of Angle (MOA) of elevation. These rings have precision hinge pins front and rear allowing the entire scope to be tilted by a micrometer-controlled cam in the rear. This allows the scope to tilt upwards (in the rear) with the front ring as the axis while both rings remain parallel to prevent scope binding. The rear ring tilts to match the front while a cam pushes it up. Ivey also makes tilting +150 MOA Picatinny riser rails.
Ivey offers three scope-mounting products. First is the BR 30-50 (above). This has two, polished 30mm 6061-T6 aluminum rings with bases to fit a 1/2″ x 60 degree Stolle (Davidson) rail on top of an action. Total elevation is +50 MOA. The micrometer adjuster is graduated in true 1 MOA intervals, with 5 MOA of elevation change per rotation. This product costs $385.00 and requires at least 5-1/2″ length mounting base. Available in either “bright” or satin finish.
The newest product is the MSRR-150MOA Riser Rail, a pivoting 5.75″-long Picatinny-style rail that accepts Weaver-style clamping scope rings. This Adjusts from Zero to +150 MOA and raises the scope 1.45″ from the top of the action. The extra height provides clearance for large objectives when the unit is tilted for a full +150 MOA elevation. Cross slots are 5mm wide at 10mm (.394″) spacing. The $425 riser rail is made 6061 T6 Aluminum hard-anodized black. Clamps are heat-treated steel. The micrometer thimble is marked for 1 MOA gradations, and provides 20 MOA per revolution.
The third product, the $445 MSR 30-150, has a pair of 30mm clamping rings that fit on a Picatinny-style (1913 mil-spec) rail. Base cross-slots for two-bolt clamp can accomodate 3/4″ to 1″ slot spacing between centers. Height from top of rail to center of rings = 1.82″ at lowest setting. Note: you need a rail at least 5.625″ long.
The Ivey products are expensive, to be sure, but they are beautifully machined, and they offer unique capabilities for ultra-long-range shooters. With the +150 MOA units you have enough elevation to shoot at 2000+ yards! Even with the +50 unit you can you shoot at 1000 while keeping your scope centered in its elevation travel. We like the idea of using the micrometer to dial within 1 MOA and then just using the scope turrets for fine-tuning. To learn more, visit the Ivey Shooting website, or call Stephen Ivey at (615) 424-8855.
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I bought the MSR 30-150 MOA for my 1,000 yd. Heavy Gun. And, I have a Leup. 45x Comp. on it. I have used it from 100 yds. to one mile and it works fine. I am thinking of getting one for my Panda action when I convert it to 6XC for 1,000 yd. shooting. I do load development at 100 yds. and shoot comp. at 1,000 yds. so the vert. MOA adjustments are very useful. Badlands
I use the BR30-050 ring version on both my Stiller Cobra actions. Both my sets fit and worked perfect. Just follow the simple instructions. None of the rings required lapping and both sets were in perfect alignment as installed. Steve Ivey makes a fantastic product and is great to work with be patient if not in stock but he hit his promised delivery on the first out of stock set and shipped the second in stock the day after the order was placed.
I mounted the MSSR-150 rail on an AR-15 (6mmAR upper) from Robert Whitley. I don’t shoot 1000 yds. but I did want to be able to leave my scope reticle adjustments centered. I zeroed the rifle at 100 yds. and just hold on the mil-dots of the SS 20X scope to shoot long range. Steve is very good to work with and shipped my rail same day I ordered it. Fantastic product.