Around 10" is 9mm sweet spot.  Get better than pistol barrel length and close to as good as carbine 16" length.  This one with 10.5 barrel, is a much better balance.  Food for thought. The only reason to go below 10 is consealing and we aren't doing that in Canada. Some may say it's faster to move between targets but 9mm ppc comp length In usa is almost all 14.5 or 16, and those guys are real fast. All the top guys JP GMR-15, Nordic NCPCC 9mm, Wilson Combat AR9 all have 16 comp rifles that are tops at competitive level.