Get it on, well yes, quite, but what exactly. A Burris Fastfire 3 RDS onto a Glock 45 Compact Crossfire. Should be easy, right? Just buy Glock's cheap adapter kit and away you go, but not so fast. Everything goes swimmingly well until you notice the slide adapter plate's canted up at an angle towards the rear sight as opposed to flush with the slide.
Bad error. Why would this be? Two reasons. 1: You over-torqued the screws affixing adapter to slide. 2: The screws which you've handily set aside from the gun's original slide plate, the same screws which Burris tells you in its wisdom to fasten sight to slide, are too long. They protrude from the bottom of the adapter plate onto the slide and raise the thing up. Useless.
So what's the fix. Burris tells you to go to Burris and buy their special, proprietary lock washers, which will act as a kind of shim to lift the offending screw (s, there's two) by about a millimeter and hence flush with the adapter plate. Huh. Why not include M3 .50 x 7 in the adapter kit, you tightwad cash heads.
Solution? Go to the hardware store, buy some fresh M3 .50 x 8 screws and some toothed lock washers, it'll cost around 2 bucks if that. Then take them home, file or clip off the teeth of the washers. Then fix the adapter plate to the slide using Glock's provided 6 mm length screws, being careful not to overtorque, "hand tight" says the manual.
This Locktite accomplished, fix the sight to the adapter/slide by way of custom washers. And there you go, one RDS topped pistol ready to hit the range with all of its compact fury. Will it perform? Let's find out. More anon.
#2A,
LSP
