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I converted a WE into a Mk18 (mod 1).
Mk18 Mod 0/1 (as opposed to an SOPMOD M4/M4 SOPMOD Block II) by definition have a 10.5" barrel.
If you're going for a Mod 0, use the WE CQB-R as the base and you're 97% there. You'll need an LMT Crane stock and probably want an LMT rear sight depending how accurate you wanna be.
If you're going for a Mod 1 you can opt for a less expensive M4A1: the outer barrel is 2 piece so you can remove the extension and have your 10" outer (cut down the inner) and you're swapping out the handguard anyway. I used the Madbull one, no complaints. You'll also need a low profile gas block (I used an RS Badger Ord one) and an LMT Crane stock.
There's also a less common EOD variant with a VLTOR CASV-EL and either an M93 or VLTOR Modstock. Occasionally seen with an LMT rebar cutter.
And you don't need a RS EOtech, unless you really want one: I ran one of the Huang ones for a while and it held zero fine.
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