
I hear ya Gunny, Kyle and I are wanting to get into the GBB world a little more also but, from the hours of research and limited experience that has been used and observed, we are only diving into the Rapid deployed CQB style guns for now, MP7 MP9 etc. this have a better history and somewhat proven record on the positive side, with a number of guys in our club wheeling the mention weapons with good success we have made the plunge and are going to be using these in the spring.
But you did mention GBBR! I think it will be a while before these types of guns will ever be reliable in low temp weather, it is comin but a couple years away I bet. if they can make pistols some what reliable and with accuracy it is only a matter of time before their GBBR's are on the same level, but due to the type of gas and it's discharge characteristics propane just don't work well when cold.
I think Hepa will be the wave of the future! take the Polarstar and make it a blow back you will have the best of all worlds in terms of a GBBR, but with better consistency and less wear and tear and breakages. not to mention with the turn of a valve you can dial your FPS and ROF to whatever you want.
I am hoping to see the polarstar type rifles offered by more manufacturers just like the PTW frenzy happened, when systemas were the top dog they were $2000 and the only one in town, times have changed in the PTW world!