Ran across some Russian 223 ammo at a local gun show. Steel case. The guy had 5 or 6 boxes of 1000 each. Decent price, but......
He said the primers were harder (or maybe he said thicker) than regular ammo and that your average 223 rifle (like an AR) probably wouldn't ignite it without modifying it with a heavier hammer spring. I'm looking at them for my Saiga 233, not an AR.
I read somewhere that some folks had increased the depth of their firing pin strikes by removing a very slight amount of material from the back of the AK's bolt. A few thousands, I'm thinking. Would this be safe? Would a stronger hammer spring be better to try? I would think so, but wanted people's opinions that may have tried it.
To my way of thinking (that doesn't always work), having a heavier hammer spring and perhaps a SLIGHTLY longer firing pin would solve the problem, but then, if regular primered ammo was fired through the rifle, you may run the risk of primer penetration.