Hello all,
I am posting this here because there is misleading information on the internet on an "ar-15 website" that I am not affiliated with nor can easily register on to correct the information.
The Bushnell TRS25 has a screw for mounting to a weaver type base and it breaks easily if you use a warne torque wrench for scoperings and subject it to oversized handgun recoil.
That other site comes up high on a google search and is the only site that states the thread pitch so that replacements can be sourced: #6-40, 1.25" long.
That is NOT the thread pitch of the TRS-25!!
The true thread pitch is M3.5-.6. Yes, it is metric. Thread pitch is .6mm which loosely translates to 42.25 TPI. I can see how the other guy got confused. Also turns out an M3.5 major diameter is within .001" of the major diameter of a #6 screw.
Anyways, this mixup caused a week and a half delay in repair here and I'm the proud owner of an extra box of useless 6-40 screws. 1.25" is also too long, needs to be something like 25 or 28mm long. I have some correct screws on the way now, 25mm and 40mm to cut down if the 25mm is just a smidge too short. They had no 30's.
So hopefully now when people google "Bushnell TRS-25 thread pitch" they will be directed here instead, and see the true pitch of the screw.
Just an FYI for the archives.