My Seekins 6arc is a 22”. It’s a hammer and has been 100% reliable. Factory Hornady Match 108s will print with all rounds touching at 100yds more likely than not and this was straight out the box.
My only complaint is the rifle length gas. It’s much harsher than it needs to be and Seekins per an email have no plans to go to a plus 2 like everyone else. I’ll likely chop mine down to 18” to lessen the already much too long dwell time.