Design
The Model 52 was a non-rotating, rear-locked bolt-action design. The Model D-derived receiver was cylindrical, bored and machined from a forged billet, and of substantial thickness. The bolt's dual locking lugs were part of the rotating bolt-handle collar, which provided a camming action to seal the breech on closing and extract the spent case on opening. The bolt itself was undercut for the forward third of its length and rode on polished flats; a projecting lug at the front edge caught the top cartridge in the magazine. The bolt face was rebated so as to surround the case rim, and was chamfered to fit the recessed receiver ring. Dual-opposed sprung claw extractors were inlet into the sides of the bolt, providing controlled cartridge feed. A fixed blade-type ejector was located at the rear of the loading platform.
The original Johnson trigger mechanism, a two-stage or compound-motion military type derived, again, from his Model D, made use of a horizontal sear pivoted from the front; the trigger fit vertically through a pinned mortise in the sear and was shaped at the top so as to cam against the underside of the bolt and depress the assembly, releasing the firing pin; it was a cock-on-closing design. The one-piece striker terminated in a Springfield-like knurled cocking-piece. The wing safety was mounted on the left side of the receiver; when engaged it physically blocked the cocking-piece and cammed it slightly rearward, disengaging the trigger linkage.
Read more about this topic: Winchester Model 52
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