Thread: Buggeration!
View Single Post
Old 5th November 2013, 04:09 PM
Barry Barry is offline
Senior Member
Join Date: Oct 2013
Member of: Iceni Marksmen
Location: Harwich
Posts: 283

Originally Posted by rich View Post
It measures about half a degree if you measure the drop and the length and divide one by the other and use a little bit of trig.

I have the same set-up, a T35 on the Weaver rail, and it is too much slope. My T35 is barely a quarter a turn off the end of the travel, at the top of the pellet flight, and another third of a turn or so at 55 yards.

One solution is adjustable mounts but with a Weaver base they fetch something like 70 so not cheap.

AJP does a rail for the AR20 and you can specify dovetail or Weaver top, and that is adjustable, and that is one route I may take.

The other option I am looking at is to screw a length of dovetail rail to the top of the AR20 Weaver rail, and pack the front end by about half a millimetre. I have a piece of rail from Terry Robb that would do the trick. If I had a mill I could machine a slope in the underside; instead I'd have to file it by hand and then finish it on a surface plate with wet and dry paper.

The only risk areas with this are making sure that the two rails can't move in relation to each other, and that the dovetail rail is true with the barrel axis. If there is any clearance allowing the top rail to slide sideways then the left and right zero will never hold. Might end up with Araldite.
Thanks Rich. I thought I was losing it for a while. Why on earth would they manufacture and fit a rail with 30 moa in it for something designed for air field target I hope this is gonna be the only issue.
I've thought up a workaround in the meantime which might be worth a try and that is to shim under the front scope mount inside the picatinny groove. There appears to be a little space and the ring should clamp securely enough with shim under it.

I'll give it a go sometime this week. It's gonna be trial and error though as I have no clue what shim thickness will compensate. At least the scope tube will be safe

Reply With Quote