Many custom rifles are offered with upgraded 8-40 scope base screws. These larger fasteners offer increased strength over the standard 6-48 screws found on most factory rifles.
Reasons for upgrading to 8-40 screws include:
- preventing breakage during rough handling
- replacing a stripped 6-48 screw
- aligning the scope screw holes on an action (in some Remington 700 rifles these holes can be misaligned, incorrectly spaced or off center)
- increasing strength for larger cartridges
The Marine Corps uses or has used 8-40 scope base screws on the M40A1, M40A3 and M40A5- which is enough reason for me (jarhead).
In this post, I will be upgrading the scope base …read more