Going to buy an extra GRA for each of my Glocks. G19-G34-G21sf to put in the range bags and one set each for the bug out bag. Are the stainless really worth the extra monies or do the stock parts hold up really well. I am fairly new to the Glock world and am primarily a 1911 guy but these Glocks are really starting to get some serious considerations here. I just want to have some extra supplies for SHTF type scenario. My thoughts are to just buy up some standard set ups but if the stainless are really a huge benefit I will gladly shell out the extra monies.