Originally Posted By: Run With The Fox
AISI 4140? why the "jeweling" or engine turning on the front "knuckles" of the receiver?? Great concept, and the 7X57 is the all-time best of the ,284 calibers- no great recoil, good reload-a-bility in fire-formed cases, little chance of a blown out neck on the cases with proper powder and primer selection- hell of a deal--


The "jeweling" is tool marks from machining