I remember when LMT changed their gas keys to MIM, everyone on Arfcom freaked the hell out.
I am running a LMT 14.5″ upper, and even with a M4-2000 can attached, have had no issues with it with monthly USPSA style rifle matches and a Magpul class under its belt
“Why do manufactures use them in there product?”
I know this makes me trust STI’s quality control.
I thought Grant Cunningham’s writeup on MIM a few years ago was pretty useful.
http://www.grantcunningham.com/blog_files/2ca22a8b4cae7a2da440a1f09f72d8bf-86.html
I remember when LMT changed their gas keys to MIM, everyone on Arfcom freaked the hell out.
I am running a LMT 14.5″ upper, and even with a M4-2000 can attached, have had no issues with it with monthly USPSA style rifle matches and a Magpul class under its belt