Are seriously the toughest things I have ever seen. I picked one up from K-Var for using on a 5.45 conversion where I decided to be picky and wanted one of the attached units like the real AK74's have. Well anyway, it came without the hole for the magazine latch pivot pin drilled. So, I lay out where the hole should be, and then proceed to dull three cobalt drill bits and a hardened center drill trying to dent the thing. Long story short is I had to heat it red hot to remove the temper, drill it, then re-temper the guard myself... Why do I always do this stuff to myself trying to be picky?