I drink LMT koolaid, but I'm not big on the changing barrels thing. But it does work and is a cool feature if you like that. I have enjoyed shooting Colt-LMT-Vltor Monolithic uppers, they were all very good. But I still dig my 11.5 with RISII. All quality builds. LMT makes the 10.5 and 12.5. I would cut one down, seems like a waist of money and asking for trouble.
Buy the barrel you want, then build the gun around it.

