While some people disagree with this, I lean towards appreciating this decision as it only lets reputable and quality manufactures produce this style-keeping fitment and quality uniform. Originally designed by Magpul, this design is only available from manufacturers that Magpul has approved. In contrast with Keymod, the M-LOK system is simply a rectangular slot that you will insert your attachments into, and with the help of a T-shaped nut that will turn perpendicular to the hole -lock it in place. MLOK rails can always be identified by the 'M' logo on them, and the straight attachment notches Many low quality manufacturers also produce this style, and fitment may vary from brand to brand.There is some concern about security of your accessories if the rifle is dropped or bumped the wrong way.No special tools required to tighten or modify your system in the field.Once tightened, the Keymod style will self-align your accessories for you.Many high quality manufacturers produce this style, so quality parts are easily obtainable.This style has been around for a long time (well, longer than MLOK) and you will have absolutely no issue finding your desired accessories in this mounting style. Simply take the lug or “male end” of your Keymod attachment and insert it into the larger round end of the handrail or “female end”, now slide the attachment forward in the Keymod hole, and tighten the lug to secure the attachment.

This style of mount makes the physical act of attaching your accessories extremely easy. Resembling an antique key-hole, it’s easy to see how the Keymod rail design got its name. Keymodīravo Company USA was one of the last KeyMod holdouts before the industry adoption of MLOK

Read on to understand the differences between the two, and which style might fit you best. While both M-LOK and Keymod mounting systems can accommodate the same accessories that does not mean these systems are created equal. From lights, lasers, grips, bipods, or even bayonets, the handrail can fit more accessories than you would ever need. The incredible modularity and individuality of the AR platform is largely due to the ability to stick almost anything on the handrail.

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