Wrong, LMT uppers for the Mk.18 come in 10,5" while Colt uppers that are ALSO used in Mk18's are 10,3". Colt uppers are actually used more often then LMT as for the lower it can be M4A1 too. For the stock, more recent versions hae the LMT SOPMOD while older versions have the in-house Crane. Mk.18's are also seen with Colt regular and ''LE'' stocks.
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