As a rough rule of thumb: -
1. any Heckler & Koch firearm of the G3 & MP5 family and related designs (e.g. CETME Model C) will all damage the brass due to their roller-delayed blowback operation. Most other designs will only do minor/inconsequential/no damage unless it's a catastrophic failure of the ammo or the random chance that the ejected brass hits the sides of the ejection port (the H&K weapons increase this random chance to a positive certainty!).
2. Soviets used lacquered steel cases to save on brass (brass was a strategic metal they never seemed to have enough of).
P.S. the steel cases were lacquered to stop them from rusting so we're not talking about high quality steel, even with that they can still be reloaded a few times however.
Last edited by StainlessSteelCynic; 06-18-2015 at 08:05 PM.
Reason: adding info
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