New Build - Comments requested

[Captk]

I am taking another shot at building a Grendel AR. Living in NY means I cannot have a threaded barrel / muzzle device and am limited to 1 evil feature which will be a detachable mag and no pistol grip. Here is what I have selected, and I am looking for feed back on the barrel. I am trying to keep costs down but not at the expense of an accurate rifle.

Upper - Lower receiver - Aero Precision
LPK - RRA with Varmint 2 stage trigger
Buffer kit - DSA Arms carbine
Stock - Thordsen FRS15 - ugly but very functional and NY compliant.
Handguards - free floating basic in rifle length - TBD
Gas Block - YHM clamp on .750
BCG will depend on barrel selection
Barrel - The rifle will be used mainly for informal target shooting at 100 / 200 yds as that is what I am limited to here on LI, NY. I might try hunting but that would be very limited if at all. From what I have read a 20" barrel would be fine for 100/200 yds, 24" would provide more velocity but is that needed for the range I am shooting or if I get the opportunity to go longer distance?
Looking at 2 options:
A - Brownells 24", 1-8 twist HB profile with threads cut and re-crowned with target crown leaving 23 1/2" barrel. This barrel comes with a bolt.
B - X-Caliber 20" with target crown, 1-8 twist HB profile. I would need a BCG for this barrel.

Looking for feedback on the barrels. Am I missing anything?

Thanks, Ken