I snapped the bolt for my scope mount...
does anybody know the size of the thread for the scope mount hole/bolt.. i tried a 5mm metric bolt (too small) 6mm too big.. 10/32 imperial wont fit and 1/4 inch is way too big..
a 5mm does thread into the hole but there's a bit of play.
Hey buddy. This link may help...
http://www.imageseek.com/m1a/M14_Scope_Mount_FAQ_070225.pdf
Sadlak Industries incorporated some new enhancements to its M14 scope mount in late
2004. Two setscrews securely hold the wider adjustable dovetail piece (clip guide key) to
the rifle’s receiver, to keep it from loosening. The rear end of the scope mount has
cutouts to allow wrench access to the dovetail setscrews. The dovetail setscrews
securely lock the dovetail piece (clip guide key) into the receiver. The scope mount hole
for the adjustable dovetail piece (clip guide) screw has been machined with an oval slot
and a larger counterbore to make it more easily compatible with non-USGI receivers.
The front post screw size has also been increased for a larger contact area with the
receiver barrel ring.
The front screw has also been changed from a ¼ " x 28 fine thread to
a 5/16 " x 24 fine thread. The new size front screw reduces the number of hex head
wrenches from three to two. The front screw and the dovetail key socket screw now both
use the same size hex head wrench. 2006 production scope mount weights were 7.258
ounces (alloy titanium), 11.113 ounces (4142 alloy) and 4.331 ounces (7075 alloy).
