I like the compactness of the 10.5. This probably sounds stupid, but it fits very nicely in almost every back pack I have tried, super easy to transport. Why the F does it matter? Bug out bag if you have one ( I don't), truck gun, motorcycle carry on the way to the range in a back pack. The 12.5 just barely fits. I have yet to shoot my 12.5 and get some longer range data. Using my 10.5 in uspsa style matches, I haven't noticed any difference in and out of barricades, ports, around walls etc than when I use my 16" MPX in PCC. I do like extra rail length that you can can get with a longer barrel.
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