Groverino - This is the new design for the mag release, it's much smaller than the previous one.
Just picked up the same rifle with a 20" heavy barrel in 7.62x39. I had a Savage Axis II 7.62x39 before, it shot well but was not great for feeding. The Howa has been flawless. You can get some sticky extraction with a hot rifle, probably from lacquer on the cases heating up and getting sticky. Never had a failure to extract though.
If you're a reloader, a great trick I picked up here at gunnutz was to use steel case ammo (you can find non-corrosive if that's an issue), pull the jacketed steel core bullets, even the powder charges, and reload with a Hornady 123gr Interlock or SST bullet. You don't need to buy powder, primers, or cases this way.
I usually average 20-40 cases because they do vary quite a bit with powder charges from the factory. They are built to a price, and not designed for accuracy. The Norc red box is OK for reloading. Barnaul shoots pretty well out of the box if you're not a reloader.
The pic shows both the new Howa bottom plastic design for the mag release and one really nice group from reloaded Norc red box. This is not average of course, but you can usually count on sub 1" groups at 100 with careful powder measuring.
Great rifle and highly recommended! The only annoying thing is the really chintzy plastic bottom 'metal'. How long will that last?
Happy trails