The Sentinel DMB only runs SAAMI length AICS mags, as far as I’m aware. I don’t have any other 338 mags on hand to try or I’d give a more intelligent answer. That’s my one complaint with it. Looking at it and measuring everything, I think it could be machined longer and wider, it’s beefy, so if you don’t mind having someone do the work or doing it yourself, I think it could be possible. I’ve been curious, I like the AX mags a lot better and would also like to be able to use CIP length mags in it.
Mine is a 27” MTU contour Bartlein. Slower twist than most use but I’ve got me an idea so it’s gonna get shot.
The AX AICS can be machined to take the M2013, and I think Marty might actually have some on hand. XLR inlets for it, Manners, McMillan, KRG was and wasn’t inletting, not sure if they are at the moment, I cant remember any others off the top of my head. Choices are real limited for the M2013 LA, that’s one annoying thing.
One last thing, I love the combo. I think the Sentinel and a LA M2013 is a fantastic combination and it feels great. It’s going to be my primary elk gun for an upcoming Idaho hunt. I only haven’t shot it yet because the local range got shut down, and I don’t have reasonably close access to another one to do load development, and I’m NOT paying loaded ammo prices for 338NM.