I just got my 20" T1x cut to 16.5". The 20" barrel plus the suppressor felt too long to me. The barrel/action will be back to me tomorrow. Hopefully it shoots just as good as it did before.
If you're using a suppressor, then get it shorter. I don't shoot suppressed for 22, so I'm planning on going to a 20-22" on my next rifle. I love my ACC chassis and you need at least a 20" to clear it.