Just going to a tightbore will provide you with a noticeable difference (tighter grouping, which extends your useable range a bit). A longer barrel isnt necessarily going to help you. e.g., a shorter (11.5" Commando-length) tightbore noticeably ougrouped/outranged a stock 14" (m4a1) length barrel in my M933 (converted from an M4A1) -- using the same mechbox, of course.
Plus extending the barrel into a suppressor sorta defeats the point of having a compact rifle (like the g36c)
I recommend the KM TN 6.04 inners.
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