I have Larue Rails, DD Lite Rail, KAC RAS, and DD RIS II. I have Larue rails on five of my AR’s, and I will not be changing them anytime soon. The only thing I wish was if Larue would have made a continuous top picatinney rail instead of the gap.
Who bridges the gap? It’s not recommended even with RIS IIs and Geisseles. Non-issue.
I like LaRue rail dimensions. They’re like the KAC RAS which is what I prefer. That said, the LaRue attachment is a pain in the ass compared to modern designs. And I actually mashed the top rail on mine. I was able to pull the damage out for the most part by using the front of a cut down carry handle. But the LaRue’s side walls beneath the top rail are relatively thin, and have holes machined in them too.
Second vote for the URX 3.1… SOLID! I love mine…
I’m liking the KMR best… but if I had to put a quad rail on something it would be DD RIS II. I still have a MK18 on my shorty I don’t ever think I’ll change.
DD Lite Rail III/DDM4 or Centurion Arms C4 would be my top two quad rail choices.
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People still buy full quad rails? Strange.
Some people need stuff that works and don’t want to mess with complete nonsense like Keymod.
I can attach everything I want, exactly where I want it, without messing with rail sections, adapters, special mounts, or tiny little special nuts. I can then take my outdated Larue rail and everything on it and thanks to old-school qd mounts, change configuration in a few seconds.
Strange as hell I know, but I’m wierd like that.
Going to call this for what it is…
Please post a pic of your carbines, I want to see how many “serious” things you have mounted and where. I’m a dummy when it comes to this stuff, so many you could teach se lessons for myself and others!?
I could not agree with you more.
I didn’t say anything about serious or dummy. Pic from this morning. If I have to walk much, I pocket the VFG or mount it on the 3:00 rail to keep it out of my way. I keep a 1.5-5X Leupold in a Larue SPR mount handy. I also have a bipod in a qd mount that I seldom use. There’s a P2X Fury on the 9:00 rail, but if I need to I can pop an X300U off my pistol and use it on there too.
Yep. Agreed.
So true
For longer and still light Quad Rails, I’d go with the Daniel Defense Lite Rail 3.
We are in a Golden Age for AR-15s…there are so many options on everything now there is no reason for anyone to not have their carbine set up to meet their needs. I do not see why others question other’s preferences when they spell them out.
For what it’s worth, I used to think Keymod was nonsense too until I ran the system. I still run some Full Pic rails too. But the Keymod certainly has many advantages over the alternatives. Arisaka’s accessories alone make the KMR a smart purchase.
All the attachment systems have pros and cons. I’m also in the camp that still favors pic rails though.
Yes I agree…and once I actually read the instructions on how to properly attach key mod accessories, well that was a game changer 
I just prefer the simplicity of the quad rail-the rails are solid. I have seen some issues with properly installed keymod accessories coming loose when run hard. I had an in depth look at the M Lok system and think it has merit over the Keymod. All of my accessories are set up for picatinny mount, so would rather keep them as is
I really like the feel of the Larue rails- they are slim enough for me with the rail covers I use.
As I mentioned before, the weight difference is very slight between Larue and the DD RIS / Lite rail- funny that the Larue was referenced as a boat anchor somewhere in this post
BCM’s new anchor attachment makes it completely idiot proof. Some of the attachments are a little tricky and/or require indexing the keymod nuts.