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Here's some interesting ideas from phantomprecisiontactical.com
I went a step further, and used a 2.5" piece of 1/4" copper pipe. I "bedded" it in the V using some epoxy, then taped it down securely (used release agent on the LabRadar, as I didn't want it permanently affixed).I used a simple sighting device. A soda straw taped to the v groove on top of the unit. It works fine. Just like bore sighting.
Until the feds ban them, they work.
I just put my finger over the little groove and sight through the little hole.
Barrel position can be important for triggering, though I haven't had much trouble with that, other than blast causing the unit to shake or move off target and get spurious tracking results.I've used the straw. However, I forgot to take it along the last couple of sessions.
I find that the position of the barrel on an unbraked rifle has a far greater effect on whether the unit triggers than how "close" I sight down the V at the 100 yard target.