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2. CAUTION: How do I tell if I have a rebuilt RC (Russian Capture) and not an original unaltered K98k?
Russian Capture K98k's all share similar traits. The are all WW2 era German Karabiners (though some are former Gew98's the Nazis had converted to K98k spec - rare though!). Most have matching receiver and barrel.
When the Russians came into these guns they stockpiled them and promptly began doing other more important things like rebuilding their cities, etc. Many RC rifles sat for month or even years exposed to the elements. By the late 1940's, many of these rifles were in an advanced state of deterioration, while some remained like new.
In true Russian style, a colossal public make-work project was undertaken. The ENTIRE inventory of German small arms then in Russian possession (roughly half the total wartime output of Nazi Germany's arms production) was ordered to undergo refurbishment and as many useable arms as possible to be made ready. Why? Russia was paranoid. The Cold War was freezing over and Russia feared invasion from the West. Also, it was a cheap source of arms they could export to allies in North Korea, Cuba, Vietnam, and every other wanna-be commi armpit of the world without depleting their "front line" weapons stockpiles.
The Russians took all their K98k's, and totally disassembled them except for the barrel. Bores were inspected and those found to be acceptable (ie, some pitting OK - so long as it's still safely shootable, much like with their refurbed Mosins) were set aside. Those that were deemed too far gone were recycled into steel for tractor parts or Order of Lennin medals, or whatever.
The small parts were all hot-dip reblued. Rusty parts were wire brushed or sandblasted first. These were placed indiscriminately in bins. The stocks were also inspected for serviceability. Those deemed acceptable were retained, those unacceptable were burned.
When the rifles were re-assembled no effort was made to match parts. A new (used) bolt was assembled and fitted to the receiver and the whole affair was assembled into a rifle from the binned parts. When done, most parts were electropencilled with the rifle's serial number and a flat was sanded on the left side of the wood stock (think big belt sander and half-drunk worker). The rifle's serial number was stamped there running parallel to the rifle's bore line. (Yugos are stamped perpendicular, for comparison)
Once complete, the whole rifle was generally painted in cheap shellac as a preservative agent - these are often not cosmolened for some reason - crated up and sent to war reserve, especially in the frontier states like Ukraine (which stored them in underground "nuclear proof" depleted salt mines). Today, cash strapped former Soviet states are all too happy to sell these to us.
It's difficult to say what percentage of captured arms survived the rebuild programs, but I'd imagine maybe half (or less) would be a good guess. Many of these arms sat out in the open for LONG periods of time before being rebuilt, so attrition due to the elements was probably a factor.
It's also wrong to assume that RC's are, in fact, "captures". At any given moment, less than 2 million Nazi troops would have served on the Russian front. Not all would have had K98K's. Over 14 Million K98k's were built and most experts agree that somewhere around 7 million likely ended up in Russian hands after the war. Throughout the whole war, it's doubtful a full 7 million K98k's traveled to east Prussia and beyond.
When Nazi Germany surrendered to the Allies, the Whermacht assembled at depots all over Europe and turned in their arms. Additionally, government arms stockpiles and factories were captured and divied up by the victorious armies. At hostilities cessation, every Mauser weapon in the future East Germany (and all points east) would have become what we think of as an "RC K98k". Public ownership of guns in the USSR was banned as well. So whether a rifle was taken from a dead private in 1944 Minsk or if the NKVD knocked on a door in Berlin in 1947 and confiscated the arm from a retired volkspolitzei prison guard, it still ended up in the stocks of RC mausers. In fact, it's safe to say the MAJORITY of such guns are likely NOT battlefield captures. ...... (Feedback by "Claven2")