Near mfg picatinny rail, Sako 85 S - what angle?

[Bueller]

Hi all
I have an opportunity to buy a used Near Mfg picatinny rail for a Sako 85 short action. The current owner isn't sure whether it's a 0 MOA or 10 MOA rail and there are no obvious markings to identify its cant. Photos below.

Does anyone know a way to identify what cant this rail has? Is it as simple as using a vernier caliper to measure both ends?

I've emailed Near Manufacturing with the same question but just wondered if anyone here might have a suggestion for something obvious in the meantime.

Thanks in advance.

 

[Steff]

Quite simple if you have both rails at hand. On the 10MOA rail the height difference between the two ends should be roughly 0,5mm more than on the 0MOA rail.

 

[Bueller]

Thanks for that. Unfortunately the rail for sale is the only one I have access to.

Good point though - does anyone have a rail they could measure for me to compare?

 

[Steff]

IIRC the bases and rings of the Sako Optilock are not specific for front and rear. Ergo both have the same height. The same must be true for any Picatinny rail. So your 10MOA rail should be approx. 0.5mm higher at the back end than on the front end.

 

[Bueller]

Very true - thanks, I should have thought of that. Will ask the seller to dust off his verniers.

 

[Steff]

I have to correct myself. The bases are specific. The rear base has a recoil pin. But the height should be the same anyway.

 

[Bueller]

I have to correct myself. The bases are specific. The rear base has a recoil pin. But the height should be the same anyway.

The current owner has measured a 0.3mm difference between front and rear along a 150mm length, using a micrometer. Surely a 0 MOA rail would have zero difference, but a 0.3mm difference seems a bit less than you'd expect for a 10 MOA rail. Not sure what it is, does anyone have any suggestions?

 

[DavyG]

I can’t comment on the height difference with a 10MOA rail, but the 20MOA one I have here has a .030” (.76mm) of a difference between each end.
The height will differ from rail to rail as it is dependant on length.
I’d say yours is 10MOA.
DG

 

[Bueller]

I can’t comment on the height difference with a 10MOA rail, but the 20MOA one I have here has a .030” (.76mm) of a difference between each end.
The height will differ from rail to rail as it is dependant on length.
I’d say yours is 10MOA.
DG

Thanks, I'll grab it and see what I can achieve with it.
Cheers