I have the TacSol dedicated upper and love it! I have heard about poor accuracy in the conversions with 223/556 barrels so I opted for the full upper. Well worth the extra couple hundred bucks IMO. Put it on a dedicated RRA lower with two stage trigger and it Shoots nice little groups. I only have about 300 rounds through it, but I have not had a single ftf fte etc with bulk hollow points or solid points. I couldnt believe how well it ran.