16" or 20" barrel for all around shooting and occasional suppressor use.

I have a T1x with the factory 16" barrel that I use suppressed 100% of the time.
With a 6" suppressor the rifle balances and handles excellently.

If suppressor use was not going to be common then I'd opt for the 20" as it would balance better than the stumpy unsurpassed barrel.
 
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