mike and 999: 1600, 1400, 1800. it makes no difference to me. all are above critical temperature?

999: based upon your postings on this forum, i have the impression that you have achieved some success in re harding shotgun receivers. i also have the impression that your experience is quite limited. how many shotgun receivers have you re hardened?

mike: which leads me to ask you: how many shotgun receivers have you re hardened?

keep it simple and keep it safe...