The CQB length (I chopped mine almost as soon as I got it) shot fine and had range...but the groups were large at max range. I'll see how a longer inner compares directly at the next field game.
If I had to restart and buy all over again...I'd get a CQBR (the new gen is very nice).
If I wanted to run a longer inner, I'd stick the 363mm in hide it with a flash hider.
........in fact, that's what I've just done to my rifle....I'll shoot it like that tomorrow.
- CQBR outer barrel...M4A1 inner...suppressor to cover inner.
or if I don't want to run the suppressor, I'll put the outer barrel extension on to make it look like a regular M4 barrel.
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