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  #1  
Old 08-12-2018, 12:40 PM
wilderness medic wilderness medic is offline
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Default Knightís Armament quadrail pros?

A buddy is giving me a KAC quadrail. I noticed it clips into the delta ring like a hand guard. I had no idea they made ones that donít free float the barrel. Iím baffled why someone would pay the same price for one that doesnít. Is there a reason other than being lazy on the install?

Also I imagine it wouldnít be suitable for anything that requires a zero since Iím guessing itíll have some minor play in it?
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  #2  
Old 08-12-2018, 4:41 PM
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I believe the KAC rail was an early retro for the M16A2 so they could give it a quad rail to attach lights, lasers, and grips.
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  #3  
Old 08-12-2018, 6:41 PM
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The KAC RAS was the original picatinny quad rail for the M4 family of weapons. It is not free floated and I wouldn't recommend mounting an optic anywhere other than the upper receiver. People still pay a premium for these rails for nostalgia or if they're building a military clone type rifle. The KAC rail works fine and it does what it was designed for.
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Old 08-13-2018, 1:57 AM
wilderness medic wilderness medic is offline
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Think I may find someone willing to trade a free float version for it?

Sounds like it’s only good for a grip and flashlight. I can’t imagine a peq 15 would hold zero on it.
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  #5  
Old 08-13-2018, 3:29 AM
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I'm sure if you put it up for WTS/WTT someone will bite. A PEQ 15 will retain a good enough zero on a KAC RAS, and most guys that run illuminators use a constant offset zero anyway, making a tiny shift in zero a moot point. Countless PEQ 2 and PEQ 15 illuminators have been used on those rails overseas with good results.
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  #6  
Old 08-13-2018, 4:14 AM
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a PEQ will hold a zero fine it has a set screw/claw deal that secures it to the delta ring they dont move
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  #7  
Old 08-13-2018, 9:35 AM
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I ran a modified KAC rail on my National Match Service Rifle. By removing the heatshield, you can fit the KAC rail over a NM float tube. https://www.whiteoakarmament.com/sho...loat-tube.html

I went back to A2 handguards because the KAC rail was less comfortable in prone.

If you go with the KAC Rail and decide at a later date that freefloat is necessary, the mods are really easy (drill out a few aluminum rivets).
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  #8  
Old 08-14-2018, 3:55 PM
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My armorer said ours we’re free floating and did not just clip in the delta ring. Are you sure this version has been used overseas?

I don’t see a reason to use this over the other. Maybe I can find someone to trade it or just sell this and get the free floating one. Why not?
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  #9  
Old 08-14-2018, 4:55 PM
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Quote:
Originally Posted by wilderness medic View Post
Are you sure this version has been used overseas?
Don't know if they were used "overseas" but the early versions in the late 1990's-early 2000's replaced the plastic A2 handguards to provide the quad rail. That was high tech nearly 20 years ago. The new free-float version is a much better set-up.
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  #10  
Old 08-14-2018, 5:04 PM
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Here's my M16A4 clone (RAW) with KAC rail.



Interestingly, the KAC RAS rail is a named banned "assault weapon" in CA and KAC won't sell a CA resident one for that reason.
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  #11  
Old 08-14-2018, 5:25 PM
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Huh?? This rail isn’t legal? Guess there’s no way for me to buy the proper one.

How does that work. The name banned are rifles not individual hand guards?
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  #12  
Old 08-14-2018, 5:30 PM
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Quote:
Originally Posted by wilderness medic View Post
My armorer said ours we’re free floating and did not just clip in the delta ring. Are you sure this version has been used overseas?

I don’t see a reason to use this over the other. Maybe I can find someone to trade it or just sell this and get the free floating one. Why not?
The KAC RAS, in all its non-free-floated glory, was top of the line back in the 1990s/early 2000s. One-off free float tubes did exist, but they generally didn't have accessory rails on them and they were certainly not cheap enough to outfit thousands upon thousands of M4/M16s.

KAC did eventually make a free-float RAS (called, unsurprisingly, the FF RAS), but it was very expensive and very uncommon on military issued rifles. If you've seen a photo of a Soldier or Marine carrying an M4 or M16 with a quad rail on it from the 1990s or early-mid 2000s, I can almost guarantee you it was the non-free-floated KAC RAS that clips into the delta ring. The only exceptions were the SAM-R DMRs that I don't believe are in use anymore.

They're still bought and sold on the civilian market because of the nostalgia factor, and frankly because they are still extremely solid and reliable, albeit very heavy and non free-floating.
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  #13  
Old 08-14-2018, 5:46 PM
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I’ll have to look at my old deployment photos. Maybe my armorer was wrong. But I hope not since that was his one job. Lol. If it wasn’t then I’m more than happy with this. Never had an issue with anything mounted to it all deployment.
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  #14  
Old 08-15-2018, 9:19 AM
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The KAC RAS is still being used. Never had any issues with it not being able to hold zero. Just don't mount a PEQ on the bottom rail and you'll be GTG.

Here's a video from 2017. Force Recon Marines are still rockin the RAS on their M4's. You can clearly see it at 1:30

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  #15  
Old 09-13-2018, 6:31 AM
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While I don't doubt they are still in use, the guns in the video above are simunitions rifles and not necessarily indicative of whats in theater.
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Old 09-13-2018, 2:43 PM
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Quote:
Originally Posted by tonyxcom View Post
While I don't doubt they are still in use, the guns in the video above are simunitions rifles and not necessarily indicative of whats in theater.
What about this May 2018 video of 2nd Force doing a pre deployment shooting package...



Still rockin the RAS and they're not shooting sims out of those M4's.
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  #17  
Old 09-13-2018, 3:02 PM
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Quote:
Originally Posted by Stanze View Post
Interestingly, the KAC RAS rail is a named banned "assault weapon" in CA and KAC won't sell a CA resident one for that reason.
Seriously? Does anyone have penal code that backs this up? So even if you have a completely featureless rifle, no flashhider, forward grip, telescoping stock or pistol grip, the gun would still be an AW simply because of the RAS?

I dont believe that.
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  #18  
Old 09-13-2018, 5:40 PM
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Believe it:

https://govt.westlaw.com/calregs/Bro...ta=(sc.Default)

you want the second link.
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  #19  
Old 09-13-2018, 9:10 PM
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That's the old Roberti-Roos "ban by named rifle" listing KAC's models of lower receivers. The rail is not the "named" receiver.

So don't believe it.

Last edited by smoothy8500; 09-13-2018 at 9:15 PM..
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  #20  
Old 10-05-2018, 4:28 PM
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The rail is banned for sale in CA... believe it or not. If you don't believe it, just try and buy on from a dealer. HOWEVER, you can find them on eBay. That's where I found all of mine.
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Old 10-05-2018, 5:01 PM
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Quote:
Originally Posted by Stanze View Post
Here's my M16A4 clone (RAW) with KAC rail.



Interestingly, the KAC RAS rail is a named banned "assault weapon" in CA and KAC won't sell a CA resident one for that reason.
My main AR is set up as a m16a4 clone as well.

I own over ten ARs but damn if the a4's the sexiest beasts....
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  #22  
Old 10-05-2018, 6:27 PM
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Originally Posted by Guns and guitars View Post
I own over ten ARs
That's it?
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  #23  
Old 10-05-2018, 6:27 PM
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Originally Posted by Guns and guitars View Post
the a4's the sexiest beasts....
Agreed!
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Old 10-05-2018, 6:40 PM
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Originally Posted by Donk310 View Post
That's it?
I have a cap of 75 long guns...Long story a marriage thing....I have to have room in the safe for HK, AK, FAL and M1a as well!
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  #25  
Old 10-12-2018, 8:07 PM
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I have a retro-ish Bushmaster HBAR upper on a Stag A2 lower which I added a Knights RAS M5 to. They can be found used cheap and work great. Mine is strictly for a bipod and nostalgia. Just because they are old school doesn't mean they aren't still useful. And cool.
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  #26  
Old 10-12-2018, 8:16 PM
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had them on rifles for years never had issues holding a zero on a peq
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  #27  
Old 10-13-2018, 3:40 PM
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I would guess that such items as the KAC RAS were probably not vetted or tested too hard during military service. The real test to the durability and zero holding capability of these items are to be seen in the secondary civilian market. 25-50 yard slow fire indoor range engagements at oozing zombie targets are where the rubber really meets the road.
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