AR9 barrel gunsmithing question. (throat too short)

Hey Friends,
Looking for some wisdom on an AR9 problem.
I purchased a Factory built PSA 9mm AR that the throat/lead is way too short. round nose 9mm doesn't seem to have issues but I'm trying to load 124 and 147gr xtp's and I'm having to load way under book minimum OAL.
The main issue is the 147 xtp as book minimum I have is 1.100 and I'm maxed out at 1.055, which is a problem with anything other than bunny fart loads is showing pressure and excessive velocity.
I'm on a waiting list for a TACCOM replacement barrel but no idea when that may happen.
Does anyone have a price estimate to get this adjusted?
Any help would be appreciated!
The Courier
I've read that they had a run of short chambers and jamming issues.
I'd like to see what a gunsmith can do and maybe I'll learn a thing or two about blow back carbines...


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