![]() Due to steel supply shortages, for limited production batches lower grade vanadium or molybdenum steels (+AV or +CM / +MO) were used. The receiver steel hardening process was changed and improved from 1936 earlier batches may have solidity problems.įor wartime batches (1942-1945) look for "+CN" marking on the bolt carrier or locking lug indicating Chromium Nickel steel. Uniformity is also the key – the gauge should have the same resistance all the way through.Īlso, check the manufacturing dates here: 7.55 or above is a definite no go – the barrel is washed out (note: this is only valid for W+F K31s modern 300m competition rigs usually have a slightly larger gauge, and 7.55 is perfectly ok). For Waffenfabrik barrels the best precision is usually obtained with gauging of 7.53☐.01 uniform all along the riflings. Swiss Schmidt-Rubin rifles do not have the date of manufacture stamped on any of the rifle parts, so determining when the rifle (and mismatched parts, if any) were manufactured must be determined from the serial numbers. Military and civilian batches do not have any noticeable difference in precision or manufacturing quality. Both Bern Waffenfabrik and Haemmerli were producing barrels for military and civilian series. Haemmerli (hammer in a circle) barrels tend to be slightly more precise than Waffenfabrik ("W+F"), but all depends on the barrel wear. The "P" mark in front of or near the serial number simply indicate that the weapon was officially passed from army property into Private property of the soldier upon the end of military service this is not an indicator of quality or manufacturer.
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