Also posted in general airgun. This is in reply to a request to post an accurate thread size for the Front Stock Screws on both of these models. All of them are very similar and in fact will fit. It's worth noting there are two variations of screw; one has a reduced dia shank from the end of the thread to under the screw head; the other has the major dia all the way along to under the head. So starting with the correct one.
1] 7/32" BSF 55deg angle inc. 28tpi 0.219" O/D tapping drill 4.6mm
2] No 12 [7/32"] UNF 60deg angle inc. 28tpi 0.216" O/D tapping drill 4.7mm
3] 1BA 47.5deg angle inc. 28.25tpi 0.210" O/D tapping drill 4.5mm
Hope this helps in some way.