Bolt action for repeating rifle

A bolt action for a rifle of the type which includes a barrel, a stock and a sear comprising:

• an elongated receiver adapted for securement to the rifle stock and having:
• an internally threaded forward receiver ring adapted for threadedly engaging one end of the rifle barrel, and having an inclined ramp at one side thereof offset from the central longitudinal axis of the receiver;
• a rear receiver ring spaced axially along the receiver from the forward receiver ring;
• a plurality of circumferentially spaced, radially inwardly extending arcuate locking lugs secured inside said rear receiver ring and separated from each other by axially extending spaces;
• a pair of spaced, elongated receiver rails extending between, and interconnecting, said forward and rear receiver rings, the space between said rails being aligned with said inclined ramp, and each of said rails having being relieved over a portion of the length thereof and adjacent the space therebetween;
• an elongated hollow cylindrical bolt body slidably mounted in said receiver and rotatable about the longitudinal axis thereof and within the forward and rear rings of the receiver, and having a forward end and a rear end;
• and
• at least three spaced, elongated, substantially parallel bolt rails secured to said bolt body and extending axially therealong, two of said bolt rails being of substantially equal length and terminating at points spaced from the forward and rear ends of the bolt body, and a third body rail extending to, and terminating flush with, the forward end of the bolt body, said bolt rails being dimensioned and positioned so that, in one status of the bolt body, said bolt rails are aligned to slide between said locking lugs in said axially extending spaces, and in a second status of the bolt body, to be aligned with and bear against, at one of their ends, said locking lugs.