I like Colt and LMT both, but my next upper (still being planned out, probably months away as all my hobby money is going into the Z lately) is going to be a Noveske. This one is going to be an SBR set up for mostly suppressed use, probably
this 10.5 model since it comes with an M4-2000 flash-hider (which is the mount for the suppressor I want to use with it), and Noveske's "switchblock" for controlling the gas (basically, lets you cut the gas flow back a bit when suppressed, or cut it completely for manual cycling). I'm still kinda waffling between 10.5 and 12.5 barrel lengths though. The 12.5 gives a little bit more velocity, which extends the useful range of the gun for effective 5.56 terminal ballistics, but the 10.5 obviously has the compactness advantage.