These are the AR carriers I had in our shop at the time. I will add more manufacturers as they 'come through my hands' so to speak. Of the brands listed (so far)I would only consider Colt, LMT & BCM 'proper' staking. Everything else should be restaked with a MOACKS tool by Ned Christiansen. Or at least by using a hammer and punch/chisel moving some metal into the carrier key screws. When the keys shoot loose the AR becomes a single shot or worse as it can try to feed a live round with an empty still in the upper.
Colt
http://img.photobucket.com/albums/v4...king/Colt2.jpg
http://img.photobucket.com/albums/v4...aking/Colt.jpg
LMT/current S&W have LMT carriers (non-Performance Center models)
http://img.photobucket.com/albums/v4...aking/LMT2.jpg
http://img.photobucket.com/albums/v4...taking/LMT.jpg
BCM carrier
http://img.photobucket.com/albums/v4...unpics/BCM.jpg
http://img.photobucket.com/albums/v4...npics/BCM2.jpg
STAG/CMT/early S&W/early Noveske
http://img.photobucket.com/albums/v4...TAGEARLYSW.jpg
http://img.photobucket.com/albums/v4...CMTearlySW.jpg
Bushmaster
http://img.photobucket.com/albums/v4...ushmaster2.jpg
http://img.photobucket.com/albums/v4...Bushmaster.jpg
Rock River Arms
http://img.photobucket.com/albums/v4...aking/RRA2.jpg
http://img.photobucket.com/albums/v4...taking/RRA.jpg
DPMS
http://img.photobucket.com/albums/v4...Rstocks006.jpg
http://img.photobucket.com/albums/v4...Rstocks007.jpg
http://img.photobucket.com/albums/v4...Rstocks005.jpg
after the use of the excellent MOACKS on Bushmaster carrier
http://img.photobucket.com/albums/v4...arriers004.jpg
early AR10 carrier where I've used a chisel and spring loaded punch to better stake
http://img.photobucket.com/albums/v4...arriers002.jpg