Marine Cpl
.577 Tyrannosaur.
That doesn't work when a double feed is hung up on top of the feed lips of the magazine. You then have to use a screwdriver and hope that the round chambered isn't live and isn't say off accidently by the tip of the second bullet or the screwdriver itself.Nothing unsafe about the fixed mag option. My AR has yet to malfunction but if it were the floor plate takes all of half a second to remove and empty it's contents to where ever I want, then proceed to clear the issue. I can't stick my fingers up through the magwell even if the mag weren't in it so that's of no concern to me.
An alternate stock isn't for everyone even if it works for most.