Shit sorry bro I just re-read this. Doing to many things at once.
It’s been a while but I think the shell carrier came from Mesa Tactical. I went with 6 round because 8 slots would tear into my hand when racking. It has an internal tube thats just a strip of tubing you can buy at an auto parts or hardware store. When it wears out it can be replaced instead of replacing the whole saddle
But the best upgrade I made was switching the plastic follower to a titanium one. There’s no drag and the shells fly into the mag tube.