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Posted: 7/29/2005 5:57:41 AM EDT
[#1]
RAS II = free float.
RAS isn't free floating. That could explain at least some of the accuracy gain. |
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Posted: 7/29/2005 8:13:11 AM EDT
[#2]
Ive used both and have not seen any real difference. The RAS II has the hump on top, making it optimum for the Aimpoint sight. It does cramp your mounting surface for other types of sights such as the ACOG or Eotech. If you actually plan to mount your Eotech forward on the upper, near the front sight, the RAS II might provide a more stable mounting platform. I prefer the standard RAS myself.
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Posted: 7/29/2005 8:41:38 AM EDT
[#3]
I recently outfitted a grip of LMT CQB with KAC RAS and SAS lower rail.... it went to somewhere back east and never to heard from again. They were specific on what they want and what they want is a lower rail section that don't wiggle and can take some barrel strike abuse. it has been about six month and no complain yet.
As far as wiggle factor, the SAS lower rail is the way to go but it is expensive so by buying a RAS2 it already come with a SAS style lower so you can save money and get a free float rail system. two thumbs up. only thing i don't much like the RAS2 is the hump, it really factor the ability you can mount optics. |
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Posted: 7/29/2005 9:00:02 AM EDT
[#4]
Chen, Are you saying that the RASII already has the SAS lower? I have to go back and research the SAS option. It's been a while since i looked. But I was thinking of picking up an RASII in the near future. |
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Posted: 7/29/2005 9:33:45 AM EDT
[#5]
Let me double check and if anyone can confirm... the RAS2 lower has a retansion screw just like the SAS lower rail.
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Posted: 7/29/2005 11:57:49 AM EDT
[#6]
The hump doesn't really affect mounting an ACOG at all... the Eotech is another story though, unless like MTRancher said, you mounted it forward of the hump towards the front sight. Even then, the hump might interfere with fast access to the buttons on the back of the Eotech. I had an Eotech, and currently have a RAS II, but never put the two together to check function. ACOG works great with the RAS II though. Dave |
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Posted: 7/29/2005 12:19:39 PM EDT
[#7]
You can mount the ACOG on the RAS II and Ive done it. Problem is you are limited as to how far forward you can place it. My NSN would bump the "hump" and I still didnt have room to put a BUIS on it.
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Posted: 7/29/2005 3:22:43 PM EDT
[#8]
I show this pic strictly to demonstrate why most shooters don't need a free float Rail. The head shot was fired at 50 yds on my Belly using XM193 Ammo thru a 16" HBAR Bushy with a KAC RAS. How much better does anyone think they will need, or better yet, have the capability to perform. Oh yeah, Stock single stage Trigger for all the guys who need a better trigger to shoot well. if it's a working gun it's a 300 m carbine. now an SPR type rifle is a differnt story. Bottom line is you can buy accuracy to a point, after that, it's on you. 
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Posted: 7/29/2005 5:36:01 PM EDT
[#9]
For the kind of shooting I do with my carbines, free floating is not required. However, I do like the solid feel of the vertical grip on free floaters.
As listed by SMGLee, the lower is the same as the one from the RAS II kit. KAC part # 20033 quarterbore.com/library/pdf_files/clamplower.pdf quarterbore.com/library/pdf_files/rasiipartnum.pdf It seems to make more sense to just buy a RAS II. For the nominal extra bucks, I can free float plus get all those extra panels and another vertical grip. |
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Posted: 7/30/2005 10:34:05 PM EDT
[#10]
I'm not British, so I don't know what to look for. Here's the flip side of the RAS-2:
Must be using the wrong brand BUIS. With the standard TA51 mount, my KAC 300m fit fine with room to spare, With the 19S mount, I could fit an ARMS 40A in there and still move the Acog back/forth one rail notch. RAS2 + ACOG NSN on TA51 + KAC BUIS RAS2 + ACOG 11 on 19S + ARMS BUIS |
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Posted: 7/31/2005 5:44:28 AM EDT
[#11]
Yes, our (KAC) RAS2 has a clamp and with a retention screw at the rear of the lower (removable) rail. The front of the RAS2 has a "finger" on both sides that hook into the underside of the top rail assembly. Use of the lower rail clamp screw is optional for quick conversion to the M203. For everyone else, I recommend installing the screw and keeping the 1/8" Allen wrench with your field cleaning kit. Note, however, that the SAS Lower for the M4 RIS and M4 RAS does not have the "fingers" of the RAS2, but the clamps and screws between the two are identical. |
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Posted: 7/31/2005 5:49:49 AM EDT
[#12]
Damn, dude, can I dig through your junk pile?  I see a KAC FF RAS back there, a LaRue tube in there, some Magpul Ranger plates, Magpul MIAD. 
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Posted: 7/31/2005 6:34:10 AM EDT
[#13]
How's your RAS-II holding up? Mine has been rock solid since the day I got it but the damn thing seems to dislike CLP. 
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Posted: 7/31/2005 9:01:02 AM EDT
[#14]
Hey, Nice LaRue rail in the back ground..... What the heck are you doing with all those rails when you don't even own an gun....  BTW, it was fun hanging out Friday. |
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Posted: 7/31/2005 4:00:34 PM EDT
[#15]
Yes, that was fun. Mongo, those are just some souvenirs from my trip to Malibu...
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Posted: 7/31/2005 10:37:19 PM EDT
[#16]
Thanks for the info guys!
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Posted: 8/1/2005 5:18:00 AM EDT
[#17]
LOL. Don't forget the Hello Kitty doll.  Kisara- how do you have all that epuip. and not own a gun? just curious... Anyway the RAS II does make more sense UNLESS you plan on scoping it other than an ACOG or aimpoint. To me the fact that it clamps onto the reciever (a little more sturdy), FF the barrel (a little more consistancy), ease of install (no need to remove barrel nut, fsb, etc), and now the cost of a "SHOT SHOW SPECIAL" sounds good to go. The consistency of a FF handguard really doesn't make a significant difference but, would you rather have it and not need it, than need it and not have it? IDK you make the call. To me my rifle got more consistent after the FF to where I notice a difference out to 200yds hitting steel. I went with the RAS II cause at the time it was a new item, wanted something FF, and did not require removal of the barrel nut. It works nicely, for me. |
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Posted: 8/1/2005 12:31:12 PM EDT
[#18]
5000+ rounds through my RAS II, and no rattle. I'm not really sure what everyone's complaining about.... Anyway, here's the simple way I look at Free-Floating rails: No one can say it's a bad idea. And for $250 or more for an aluminum rail, it better be free-floated! |
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Posted: 8/2/2005 12:22:46 PM EDT
[#19]
This might sound dunbbut, what does SAS stand for?
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Posted: 8/3/2005 11:11:42 AM EDT
[#20]
IIRC, 'Special Air Service', as in those elite Brit forces. They are the ones that requested the modded rail for use on their C8Awhatevermathingees. |
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Posted: 8/3/2005 12:51:31 PM EDT
[#21]
Thanks for the help on the SAS, can you or anyone post a picture of that rail you are talking about so I can under stand better?
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Posted: 8/3/2005 12:53:19 PM EDT
[#22]
Hav24, where can I get some of those M4 sight/targets? Just the white Military M4 type targets, I have some IDPA cardboard targets.
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Posted: 8/3/2005 1:39:57 PM EDT
[#23]
+1. That is an interesting looking (printable?) target, and I have a 6920 to sight in next week... ;) |
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Posted: 8/4/2005 10:04:12 PM EDT
[#24]
Harv24, or Anybody, Please tell me where did you get the M4 300 meters targets,I want some?
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Posted: 8/5/2005 8:23:33 AM EDT
[#25]
You can download them for free from www.MD-AR15.com in the Documents section (you have to register as a member first). Just print them out on Cardstock or plain printer paper. We have the M4 and the M16A2 versions (they have different grids), there are also versions for those that prefer the superior 50y Santose IBSZ. |
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Posted: 8/5/2005 9:44:43 AM EDT
[#26]
Forest, Thanks for the help.
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