I bet sand cuts on the bolt would solve quite a bit of the jamming problems on the Ar/M-16 variants, but I've yet to test that out. (Maybe I'll make it a future project).
But anyway, what firearm are you talking about? If it's the AR/M-16 variants then it really comes down to WHO made the parts: Factory spec. or aftermarket? This fact makes a WORLD of difference in reliability issues.
The aftermarket magazines and springs that the army ordered for use in Beretta sidearms are a good example of this. The army has learned to order factory spec. equipment when they need parts and accessories.
Militech will also make a big difference with problems relating to "dust gumming" in the action with sand and powder residue (however it's NOT a lube but a metal treatment application!!).
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Science is the organized unpredictability that strives not to set limits to mans' capabilities, but is the engine by which the limits of mans' understanding is defined-Yahoshua
  
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