Originally Posted by Savuti
The pattern was changed in early 1933. Easy way to remember which is which - Horizontal lines = High Velocity OK.


[Linked Image from i.imgur.com]

Colt made a kit to retrofit earlier guns for Hi Vel ammo consisting of a heavier Main spring and heat treated M.S. Housing.


Mine has the one on the left. Thankfully, I have plenty of std velocity ammo. Thank you.

A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”