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Don't know about the Echo1 OCW specifically but the overall layout is pretty common (AK10x with rail and M4 stock adapter): Magpul AK, WE PMC, etc.
Mag changes aren't as quick and clean as on an M4 and you'll probably want to add some kind of tactical mag release; a magwell flange (like on the PMC) helps with reloads; you're using an AEG so you don't have to worry about the charging handle (which makes reloading an entirely new experience on the gas versions); stock AK iron sights are a PITA throwback to antique rifles so be ready to get some optics but beware mounting anything too big/heavy on the gas tube rail or everything becomes very front heavy real quick (a Micro T1 is good). Otherwise get an optic mount or AK sight (like Kobra).
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