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They're both realistic, run whatever length you want. The MK18 MOD 1 is effectively a complete lower, and the "Block" refers to what's available to mount on the rifle, that includes upper receivers.
14.5" barrel with 12" RISII
12.5" barrel with 12" RISII
10.5" barrel with 9.5" RISII
The 10.5" barrel looks way better if you want to use a suppressor
With a GBBR, you only need 250mm of barrel or so to be accurate so barrel length is a non issue for performance
First to upgrade on a GBBR, barrel and hop rubber.
First on an AEG, barrel and hop rubber =p
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