I just purchased (for grins and giggles) a B-square scope mount for the 1903A3. Discovered some impediments to it's usage.
This mount uses the magazine cutoff mounting hardware. Just remove the magazine cutoff lever and install the mount in it's place. Discovered immediately that the mount would prohibit the removal of the bolt unless I first removed the mount. A few minutes of precision machine work modified the mount sufficiently to remedy this problem.
The mount uses 2 set screws, located on the top, one forward of the magazine cutoff mounting point, one behind it. The front one is supposed to line up with the ejector pivot pin, the rear is supposed to line up with the upper detent which holds the cutoff lever in position. Neither of these set screws could line in the proper position. Again, a bit of precision machine work resolved the problem.
Now the mount could be installed and the scope added. There are 2 more set screws that provide for elevation adjustment. There is no adjustment for windage. I use a laser cartridge to boresight. The maximum windage adjustment on the scope would not quite bring the laser dot in line with the vertical crosshair. Haven't yet figured out just what kind of precision mancine work will be required to correct this (hopefully) last problem.
No problem, I'll just call them. Yeah, right. Trying to contact b-square gets me to a web site for Safariland. There is an 800 number which gets me to a Verizon recording, "the number you dialed cannot be reached".
Just wondered what kind of experiences others may have had.
John Carlson. CBA Director of Military Competition.