In addition to theoretical accuracy, there is the matter of mechanical accuracy.
2.
The front sight is mounted on the gas block which makes for one less attachment to the barrel, adding to the mechanical accuracy.
3.
It was likely removed from the Tabuk design to enhance mechanical accuracy and reduce weight, though had it been retained it might have added useful stability ( practical accuracy ) for long range work.
4.
Moore's monograph, " Foundations of Mechanical Accuracy ", is a seminal classic of the principles of machine tool design and construction that yield the highest possible accuracy and precision in machine tools ( second only to that of metrological machines ).
5.
The advantages of this system are a simpler manufacturing process due to the absence of a locking system and a high mechanical accuracy due to the barrel being fixed in the frame; the barrel does not execute any sort of lateral or vertical movement during the operating cycle as with the prolific Browning cam-action systems used extensively in other locked breech pistols.
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