I like PDW type guns; they are really compact intermediate cartridge weapons, that can fit easily into a range bag.
The Serbu SU-15 semi-auto 5.56mm uses standard AR bolt heads, barrel extensions, and barrels. As well as the PDW length, a pistol, and a longer 16″ barreled carbine will also be available. The non reciprocating charging handle can be moved to either side. The buffer spring, buffer, and receiver extension/buffer tube are not needed with the AK type recoil spring. This requires a proprietary bolt-carrier but allows for a folding stock. The stock and complete 7075 aluminum upper will be available separately or as a complete firearm.
Per Serbu’s facebook page, ideas are floating on making the handguard in Magpul’s new proprietary mounting system or the KeyMod system. Serbu was undecided at the time of SHOT Show, eventually maybe both. I think both systems are fine but I’m partial to KeyMod.