Is Czech 7.62x51 ZV 69 corrosive?

[Grizzlypeg]

Anyone know for sure if the 7.62x51 ZV 69 ammo with the black primer is corrosive?

 

[BattleRife]

I know for sure that it is. Very accurate stuff, but it rusted the piston of my FN. Remember to clean your gas system, too!

 

[Speckfire]

I know for sure that it is. Very accurate stuff, but it rusted the piston of my FN. Remember to clean your gas system, too!

LOL OMG yes ... I remember that ... Very corrosive

 

[Grizzlypeg]

Ok, I was treating it as such and will continue to respect the need to clean the gun thoroughly after shooting it in my M14. I got it for cheap, so it makes up for the extra cleaning requirement.