Last week I purchased a BCM pistol lower from Grant (great price). Today I a BCM BFH 11.5" Carbine Upper Receiver Group w/ Daniel Defense Omega X 7" Handguard from BCM. I will be using a Sig Brace on my pistol. I plan to add a T1 and Vickers VCAS sling.

This is my 1st AR pistol and have a few questions:
What is the best way to mount / attach the Vickers sling near the Sig Brace?
Also what is the optimal mount for a co-witness with the AimPoint T1?
I know a vfg front grip is a no go with the AR pistol - what is the recommended front angled grip that is good when used with an AR pistol?

Thanks