I'll be starting another AR build in 2016, I'm thinking 18-20" barrel for this one, A2 front site/ A frame gas block. Anyway, I've already got one AR with a free floated quad rail (which still needs a ton of rail covers) and want something different. I'm torn between the M-lok fore end and the Keymod fore end. I like both, have accessories for neither, so I'm not invested either way. I like the aesthetics of both, but have used neither.