223 Trainer Barrel Length Advice

If and when I ever get around to having the money for a 223 ai “trainer”, I plan on matching my 6br to the T. Same length (27”),same contour(heavy rem varmint), same chassis (if possible as AX chassis’s are getting harder to find). If you don’t want identical, I’d go minimum 20” to retain some velocity and then the barrels not overly long either if that matters to you.
 
I went with 28" to better match the overall length of my 26" Dasher since the former has no brake and the latter carries a Heathen.
 
I just went from an 18” to a 1/7 24” barrel on my .223 and I’m loving it, and enjoying the free velocity..A .223 trainer needs to be your funnest gun to shoot , so if you’re gut says 16” suppressed just roll with it, me personally, I get tired of lugging long, heavy axes back and forth to the range..
 
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