KCI mag question regarding bolt hold open
I recently purchased an M1 ( in November of 2020) and in my excitement I also did some research and realized that other than GI mags most people say KCI is great mag. So I purchased 8 from a site I don’t even remember now. They came individually wrapped in a paper wrapper and a follower with no bolt hold open (which I prefer). So about a week ago I purchased another 5 KCI mags. These however to my surprise, came in a plastic ziploc type bag and have a bolt hold open. So I started reading and it looks like maybe KCI only makes there mags with bolt hold opens now. Sooo... my questions are. Is there maybe a KCI mag w and maybe 1 without? Or have they just went with 1 type now? And if so... is there any place I can get the KCI mags without the bolt hold open anymore? Any info would be appreciated gents. Thank you.