Well given they are using my solution posted here on page two of this thread for tennon insert as core feature of new action its a machined cone protector with cuts for extractors so barrel can utilise a cone breech ,it also enables minor head space adjustment by screwing a barrel in and out a bit, being a Rem40x type action with lug raceways it indexes of those while also centering bolt face. All in all good concept for 40x clone
one more tip while mine and theirs was for simple tapered cone breech , i would recommend trying radiused breech variant so that extractors have better purchase and continue to extract when extractor slots get fouled with wax and gunk.
*as a greedy bastard i hope L3I could get me couple of their mags for the whole insert idea ,would take blems