I run keymod on my AR's rail and it's great because it's actually HOLES in the rail so it's able to be lighter than if it were picatinny, there are also adapters for keymod to picatinny if the attachment you require is only able to be used on picatinny.
Problem with M-lok currently, is that there's not really enough attachments for them. I can see M-lok being more popular in the far future though. Just my 10c.
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