I went ahead and ordered a 16" CORE from Rooftop defense for $309 this morning. 1.7 lbs isn't too bad and I'm tired of waiting on Sionics. Plus I will be using my suppressor so the weight towards the chamber should help the balance. I really like Sionics but the 18" Criterion just gets better as I shoot it, I'm hoping the 16" will be as good.
We have a few CORE barrels in our office. They all seem to shoot tighter after 300-500 rounds.
