Webley Pistol Threads
Following a request from a fellow member regarding the special threads on W & S air pistols namely the MKI; Senior and Premier 1: I have gathered as much info as I can and list it below, I understand the form is Standard Whitworth.
0.106"Dia x 50 tpi S35 brl catch stop sc
S22 brl jnt lock sc
M32a brl jnt lock sc
M32 tr adj lock sc
0.150"Dia x 36 tpi M14 grip sc
M15 sight sc
S15 sight sc
S13 & 14 grip sc
S34 brl jnt sc
M39 sight loc'n peg
0.150"Dia x 50 tpi M31 tr adj sc
P56 tr adj sc
0.180"Dia x 50 tpi S21 brl jnt sc
M23 brl jnt pin
0.250"Dia x 30 tpi M212 piston sc
0.853Dia x 24 tpi S10 & M9 breech sc
Some may be for straight grip pistols, I don't have that info; but I hope this helps collectors in general