Thinking of buying a AP5-P

After shooting my buddies, full sized AP5 suppressed and checked it out. I'm considering getting the AP5-P or "K" whereas my buddy will get the AP5-SD. Basically, all of us will have the line up. Neat. My question is.. is the AP-5P "package" worth the cost over the core? Core is $1,125 vs 1369. You get two extra mags, the MKE optic rail and the SB tactical brace, sling, cleaning kit.. From my research, is the MKE optics rail the weak link? I was just wondering if that "package" is worth it or not.