scope rail screws

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05-20-2019, 10:05 PM
Ray1953

scope rail screws

I want to replace my scope rail. I ordered a night force 20 moa. It came with what is suppose to be the correct mounting screws 6 X 48. They are way too small. So I ordered 6 X 48 and 8 X 40 screws. Neither fit. #6 is too small a diameter, and the #8 is the correct diameter but the wrong thread pitch.

The Gun:

Savage 110 FCP in 338 Lapua Magnum. Bought a year ago brandy new.

The receiver is a long action of course.

Everything I have read says 6 X 48 but they are so small you can remove them without unthreading them.

So are these things metric?
05-20-2019, 11:14 PM
Dave Hoback

Should be the 8-40 screws. You may need to run a tap through first to chase the threads. It is very common for Savages to have buggered up threads brand new. Makes it seem like the screws are wrong.
05-21-2019, 12:22 PM
JeepsAndGuns

Read post #5 in my thread here: http://www.savageshooters.com/showth...56-rifle-build
I assume the threads are not cut perfectly. I have a tap coming in the mail to chase the threads and new screws coming as well.
05-21-2019, 02:21 PM
Dave Hoback

Quote:

Originally Posted by JeepsAndGuns

Read post #5 in my thread here: http://www.savageshooters.com/showth...56-rifle-build
I assume the threads are not cut perfectly. I have a tap coming in the mail to chase the threads and new screws coming as well.

I was thinking of your thread when I answered this one. That is exactly it! Savage drills the scope mount holes before finish reaming & polishing the bolt channel. This forces flashing & burrs into the threads. But they don't chase the threads afterwards. Very typical on Savage rifles.