Originally Posted by
Aimstraight
Last time I looked they were available new from B.A.R. for around £23.
The data sheet is probably on their site, that shows the diameter barrels that it fits into. It comes with a sleeve insert for fitting the smaller barrels.
I had one on a Brummie Xocet (.177); very robust fit and serves well as a cocking aid on a carbine barrel.
The gland nut tends to get marked by spanners, but that can readily be tidied up with G96 gun blue cream.
HTH
Edit - Still listed on BAR, price has gone up to £32.