The M11-A1 is NOT a mil issue M11. It's a 229 stamped M11-A1 & produced for civilian sales. Go to your local Sig dealer, pick one up and you will see it isn't a good idea to regurgitate the crap you pull off the internet as though it were spoken from on high. A real M11/P228 has a stamped/folded & welded slide with a pined block. The slides on the M11-A1/P229 etc. are "ALL" machined from a single block of stainless steel and heavier. Not that there’s anything wrong with that. They are what they are and are frankly pretty damn impressive. No matter how they stamp them they just aren’t an M11