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Geissele gave a good rundown of the pros/cons over at arfcom:
Later gives a price range:We are still going to be making Keymod rails. As well as M-LOK rails. And as well as the Geissele screw insert rail (MK1) and the Geissele MK2 and MK3 slide nut system rails.
As a mfg I can say that M-LOK is way easier to make than a Keymod rail. Way easier. The back chamfer on Keymod sucks time up in the machine, too much to make it worth producing at the same price as our MK2-MK4 rails.
The rails also feel much better in the hand since the M-LOK apertures can easily have a generous chamfer. A chamfer on the Keymod aperture can't really be done very well since the wall is so thin at the edge of the back chamfer. The a bare finger sliding along a row of Keymod apertures feels like a dull cheese grater (my opinion)
The Keymod accessory rail is tall in comparison to the M-LOK accy rail (Geissele OEM are shorter than both).
The M-LOK accessory rail is also easier to make. No special seats for odd ball flat head screws. No staking of the nuts which are not relatively easy to make. No special back chamfer tools that require a specially ground tool or one available from one or two tool suppliers.
The button head cap screw for M-LOK are readily available and the flat head design allows you to get more torque on the screw vs. an angled head screw that acts like a torque limiter.
M-LOK accessory rail has nice shear lugs that extend from one end of the accy rail to the other, not just in one place so rotational force into the accy rail is resisted better.
Detractions to M-LOK: The nuts need "adjusting" to the internal thickness of the rail mounting surface. It only takes a second or two but Keymod can just be cranked down.
You have to be careful after adjusting that you only loosen the screw 1 turn to remove. If you just start unscrewing the nut will rotate out of its cam and you have to turn the screw back and forth a little to get it to line up again.
The M-LOK screws require some kind of prevailing torque as the screw is unloosened to work "well". A screw with a polymer patch works good, or a little bit of purple loctite or even grease. If there was absolutely little friction to the screw/nut the system would still work but it might take a little finagling to get the nut into the unlock position.
Personally, I think rail manufactures will like the ease of making M-LOK rails and this will drive availability.
If I can answer any questions let me know.
We will have pre-production MK8 rails at our booth at the NRA show.
WHG
SOURCE:http://www.ar15.com/forums/t_3_118/6...od.html&page=2About $250 sans accy rails
IMHO, Geissele's SMR MK1 still reigns supreme, but the M-Lock vs. keymod competition is only a plus for the consumer.
Exactly the KMR and the Magpul are completely different designs. Magpul developed an improved version of their own attachment method. They chose not to use Keymod because they thought it would not be optimum for polymer hardware, and I would think Magpul knows a thing or two about polymers![]()
[QUOTE=Bearded_Brometheus;1901471]
SOURCE:http://www.ar15.com/forums/t_3_118/6...od.html&page=2/QUOTE]
Thanks for the link
Here is a short video from Magpul showing a little bit of it in action on a MOE handguard.
That is another thing that will keep it going regardless of anyone's opinion of it, the MOE handguards.
Definitely. There are plenty of accessories available for the keymod already and you can bet there are tons more in the works from familiar companies and ones not so familiar alike. As a company, Magpul going off in somewhat of their own direction looks like a good move for them and us. With the mounting hardware requirements for keymod it's hard to differentiate yourself from the competitors pricewise so an effective original item is the key. Most bases have been covered already as far as accessories go so a Magpul keymod line would be spinning the tires IYAM. I'm satisfied with the ones on the market already so I'd rather a company like this focus on moving in a different direction to see what turns up. R&D that's not on my dime but can benefit me in the future is always a good thing.
That's a good point and spot on comparison. I'm fine with as many options as possible though; better chances for more people to find what works best for them both in functional and monetary means. I fully expect Magpul to come out with a dizzying array of accessories for this right off the bat. The comments in the arfcom link above make me hopeful.
I just looked at the Geissele website and the cheapest keymod rail they have is $300. So as Mr Geissele stated on TOS, the price for the M Lok rail is $250. That is a major difference in cost and shows how much more it takes to manufacture a keymod rail.
http://geissele.com/rails.html?p=1
I had been looking to replace my heavy older Troy 11" Bravo with a keymod rail but I just couldn't make a decision on which one. The sharp corners (close up pics look sharp at least) on the keymod holes were my main concern because sometimes I don't wear gloves (I know, shame on me) and I hold on very tight. My hands are ruff and calloused from being a mechanic and playing guitar but I still use ladder covers. Pressing flesh into those little holes with sharp corners with a recoiling rifle seemed like a bad idea. Anybody actually use their keymod rail without gloves? Unfortunately, I have yet to handle one because I live in the boonies. The Magpul M-lok looks like it could be light and takes that getting cut concern away for me.
Magpul makes good stuff on the regular. I don't think they would just make stuff willy-nilly to be a special snowflake. I have a Troy 15" Alpha on my 20" that I like but getting extra rails or moving them is a pain. I've learned to move them by using a magnet on the attachment plate but it sucks to have to play with it that way. I guess I have to use what I have for now but I'm looking forward to hear from some guys who've used the Keymod that get some hands on time with the M-lok.
Appeasement is never the answer in the face of naked aggression.
Too much noise and irrelevant crap on this thread - ONLY 2 things matter:
1) M-Lok slots and locking mechanism will be easier and cheaper for rail MFGs to machine than Keymod.
2) Magpul will put all its weight to market many direct attach M-Lok accessories
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