From my experience with the sub2k, it is an interesting back packing design and that is it. If you want a heavy carbine that is dead nuts reliable and just a bit slower to assemble for use, the Ruger PCC will work and also work as a competitive Competition gun if you are in that sport for the fun of participation. The Gen3 is clearly in response to the S&W FPN which again was made to satisfy the needs of backpackers. The suggested downside to the gun as above is it relies on M&P mags not Glock mags. You get three mags with the gun for 30 rds here in Canada. In what Universe does anyone think you might need more than 30 rds available to you while using in the bush? The FPN is not designed for competition though for that we have the new entry carbine form S&W which is a gun that is not really designed for bush patrol but likely is capable and reliable enough to compete in the Competition world.
I guess what I am driving at is if you are looking for a 9MM carbine try to define what you are going to use it for the most then look realistically at what your 2nd use is.
For me, with no kids or mortgage to worry about I went with a Raven9, build quality is just a cut above my FX9. The latter now is a dependable shooter with round nose bullets and with a lock back feature that works with some but not all Glock after market mags. Forget Glock OEM mags though, none will hold the bolt back after the last round, period in my gun. The FX9 with a 10" barrel sings in use with IDPA/IPSC Competitions (when I say sing it is more like a slow waltz). :>)
Take Care
Bob
ps if you really do hike in the back country and want a gun to take small game with buy a compact carbine in .22LR. If you want something for both small game ie rabbits and defense against bears carry a 12g shotgun with slugs and birdshot.