Ultimately it's not as thought out as it should have been. Bolt catches don't work, you lose the ability to use aftermarket stocks that do not re-use the factory liner, and there are simply better options out there for using 7.62x39.
I can deal with the weight and size of an M14 in it's native caliber, but there is simply no reason to keep such a form factor when downsizing the caliber unless it's for military training. As mentioned before, there are more practical platforms for using 7.62x39, such as the Mini-30, SKS, AR-15, CZ-858, and a handful of bolt actions. The x39 version, in my opinion, is an answer in search of a problem.
I see some people are referring to the AK magazine not supporting a bolt hold open, which is not the concern I have with the latch being inoperable. Any new production firearm should have a hold open that you can actuate manually, regardless of whether it holds open on it's own or not after firing. Full size M14's have this, so why did they go backwards? The aftermarket has catered to the AK with safety levers that can hold the bolt back, so that argument falls flat.
It doesn't offer any real advantage over any other commonly available system, except for price, though not by much. With some of the gremlins from the original M-305 still appearing in the B model, I'd wager that it'd be worth saving the extra 2-500 bucks in favor of better fit and finish.
