As others just said, there are no basic differences in hexes and rounders.
I own examples of both (because that’s the stuff I could afford last year).
I love my refurbed '31 Izzy the most, but my very fist own gun was a rough-ass trusty '43 Izzy, even if I overpayed for it (for circumstances beyond my control at the time).
The only difference really is the the age of the rifles. Up until 1936, all Mosins were hexes. After that year, they decided on a round receiver to simply the manufacturing process. Also, these pre-war round receivers are as nicely made as the early hex 91/30s. I’ll vouch for this myself, since I got my buddy to buy a '39 Tula which I compared side by side to my '31 Izzy Ex drag. The high wall receiver is there, as is the nicer machining for the clip guides.
The quality of the wartime production round receiver guns aren’t on par for late war Japanese small arms
Where could I see more information on this?
As Templar said, the internals are good to go, and that’s what matters. I can personally vouch for this as can many other people that shoot these a lot. My '43 is the gun I’ve shot the most besides my .22 CZ. And boy, it has the matching bolt, and that motherfucker sure is smooth in there. It’s like a bolt action AK!
In fact I will say that they are the AKs of bolt actions. They’re dead simple (the bolt on has six major pieces, the FCG has like 4 parts) and rugged. And the barrel doesn’t feel that long after you get used to it. Also, the recoil isn’t that bad. For what it is (a combat bolt gun) you get a great price:firepower ratio.
Also, it’s one of the few things you can get from century and not expect to be a POS.
One thing that I have noticed over the last year is that the price of the carbines has been increasing. I think the standard price for an M-44 is at $200+ these days, and an M-38 probably goes for more. Even the 91/30s will go up in value someday, so don’t bubba them. Most of those end up looking shitty anyway.
I feel like putting up some pictures, because at this point in time it’s rate when I can actually talk about guns I use and own. (That’s right, never shot an AR; at least I can afford a nice Arsenal AK now).


Here’s a receiver just the way Templar likes them!

Here’s my beautiful '31.

The middle and right one are mine; the one on the left is the '39 that I mentioned earlier that belongs to a buddy.
