I'm about to order a lower to assemble into an AR pistol. I've never owned a BCM but they seem generally well-regarded around here.

I plan to put a Colt 11.5" upper on it. Could I run into any potential problems putting a Colt upper on a BCM lower? Generally I like to keep a gun all the same brand, but Colt doesn't put out a complete pistol lower as far as I can tell.

Can I buy a BCM lower with confidence? This will be a truck and home defense weapon.