This sight is shown on an RPA Quadlock Action. 

•#1 and #2 are 32 TPI.LH. Yielding true angular movement at a radius of 35.810 ".
•1 Euro and #2 Euro are 32 TPI. RH. And true at 35.810".
•#1 Euro- 18 min. per side, 48 elevation.
•#2 Euro- 30 min. per side, 48 elevation.
•All screws are heat-treated, thread ground 440 SS and hand lapped individually for final fit.
•Pinholes are precision bored for size and location, hard anodized, and diamond honed.
•Mounts on a standard Redfield base. (See Rifle Hardware)
•With regular washing and lubrication with light oil, these units have shown over time to hold their ability to repeat without backlash.
•All windage blocks are tapped thru 9.5mm x 1 to accept Gehmann/Anschutz apetures and shades. A reducer bushing is available for Merrit discs.

NOTE: The above values are at true sight radius. #1&2 U.S. and #1&2 Euro have the same amount of travel, respectively.