In the link posted above you can see the mags it takes. They aren't AK mags. Definitely a proprietary mag. There's also a pic where he inserted a magpul 7.62x39 mag as far as it would go and it won't lock in or insert far enough to feed. Modifying an AK mag looks like it would be much more tedious than just grinding off the lugs and adding a mag catch hole. Better to just buy the proprietary mags I think.
The barrel looks to be similar to the SCAR. You need a torque wrench with the proper size torx bit to remove and properly reinstall the barrel. Still a step better than an AR15 as no vice, receiver/barrel extension block, or workbench is required.
Looking at the manual, it looks like converting from 5.56 to 7.62x39 is NOT a .300 blackout type swap involving just a barrel. You need a different bolt, barrel, recoil spring, magazine, and maybe some more things I forgot. That's going to be an $800-1000 conversion kit, best case.
All that said, the Bren 2 really looks like a great machine. They certainly got the weight right.
There are two aftermarket solutions I already want to see though: a part with "wings" to take the secondary bolt catch/release out of the trigger guard, and an adapter that allows replacement of the factory folding stock's butt with one shaped to accept a pistol brace, like one made for the CZ Scorpion's folding stock that accepts a Tail Hook brace.
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