I am about to build an AR -15 Pistol. I am planning on using a Sig Fore-Arm Brace, providing I can find one in stock. A 10-11.5 inch barrel have not decided on which brand. The same with the forearm / rail. I am debating between the Seekins forged lower and the the billet SBA15 and the same on the upper, either the forged or the billet 223 upper. So who has either the forged or billet and what are your impressions? Thanks in advance.