Here are some document excerpts regarding the PTRD bolt-action anti-tank rifle, that a lot of modern milsurp collectors might feel empathy with.
"Recent reports from the fronts, regions, and armies remark on cases where Simonov and Degtyaryev ATRs do not work
...
Experience shows that when using PTRs in summer conditions, even when maintaining them according to section 1, there are rifles that do not extract freely. In order to continue use of the weapon, authorize soldiers to apply wooden mallets."
"Experimental PTRD from factory #74. 610 rounds were fired in various conditions, and 189 extractions (31%) had to be performed with a mallet. The report stated "This PTRD works unsatisfactorily in any conditions". Another PTRD from the factory earned the review "This PTRD works exceptionally unsatisfactorily in any conditions". Out of 275 shots, 264 needed a wooden mallet (96%).
The third PTRD managed to surpass that result. "The lifetime of the rifle was 43 shots. Every extraction needed the mallet. After extracting the 43rd casing, the bolt handle fell off."