"Dave Hinz" wrote in message
...
I've got a 1927a1 that I'd like to make another bolt for. It's .45 ACP,
and strictly a blowback mechanism. Any hints on which alloy of steel to
use, and/or what hardness to "shoot" for when heat treating? Seems
pretty soft as shipped and the grinder test doesn't seem to tell me
there's a whole lot of carbon, but it's been a long time since I've had
someone teach mhow to read sparks to guess at alloy.

Thanks
Dave


Don't know if this is any help but Hatcher's Notebook shows a M1 Garand bolt
of 8620 treated to Rockwell C 55 to 59 and the M1 Carbine bolt of 4140
treated to Rockwell C 48-54. I thought I remembered Thompson info in the
book also but was incorrect.

Steve.