GUNSMITHING SERVICES: 8-40 base hole receiver threading Type:Stand Alone Fully Adjustable

Fully Adjustable

*Notes regarding receivers and bolts:

It just better supports the handle and finishes are more predictable

(most do as this is the most popular size)

The parent part is probed to determine the exact position first

GUNSMITHING SERVICES: 8-40 base hole receiver threading Type:Stand Alone Fully AdjustableAn unfortunate side effect of production grade receivers is the tendency for certain features to be machined slightly out of position. Our 8 40 optic base hole upgrade is intended to resolve this issue, additionally, it can also add base holes to receivers that were not originally machined for them. (1903 Spgfld, Mauser, etc) By aligning the receiver bore parallel to the machine's work environment, we can correct positional errors on existing holes