re: 13” 308 MCX SPEAR??

I was able to shoot the 556 and 308 spear at a shoot sig event. The 308 suppressed had surprisingly low recoil for a 308. It was one of the better shooting 308s I have ever shot, but it comes with a pretty steep price tag. I can't see any advantage of the 13" over the 16". To me dealing with the SBR/brace over 3" on a large frame rifle isn't worth it. I liked the 556 spear so much I got one. It's my favorite AR platform rifle I have now.