Hart made 6 action different sizes Number 1,2,3,4 1A and 2A length of action varied.
Hart action had bolt stop on left side of action and they used a Ruger bolt handle,remington bolt and winchester extractor they varied on right or left lug and they use remington components in the firing unit. Recoil lug,trigger guard,escutcheon came from Remington.
Here is picture of Hart bolt go to post #10
http://benchrest.com/showthread.php?...t-rifle-action