AR15.Com Archives
wreckdiver  [Member]
1/4/2008 4:54:42 PM EDT
I would like a rail system for one of my AR carbines, and I'm thinking either the KAS RAS or the Surefire m73. I like the quality and durability of the RAS, but I like how tight the Surefire locks up. Those of you that have the RAS, how loose is the bottom section? Some I've handled were kind loose. I don't want a free float, just something snug to mount a vertical grip on and maybe a light. Weapons in question are a Colt 6450 and 6920.
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Sumoj275  [Member]
1/4/2008 5:08:39 PM EDT
My RAS on a BM M4 and Colt A4 are tight as all get out. I had a guy tell me to put aluminum foil in the brl nut teeth if they ever get loose--then again that was on a regular set of hgs (not sure if he was right as I never tried it).
CaTalystX  [Member]
1/4/2008 5:14:38 PM EDT
Usually the RAS locks up very tight....and the Surefire is not exactly a stellar piece of equipment.

Get a Troy rail if your concerned about the lockup on the RAS :D
Alpha-Romeo3  [Team Member]
1/4/2008 5:22:53 PM EDT
My KAC M4 RAS bottom rail section is still tight after more than 2 years of average use on my LMT Defender 16" M4 carbine.

You could get the optional KAC UK-SAS lower rail with clamp Part # 20033 which clamps on to the barrel nut instead of just being held by the delta ring.
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yakrat101  [Team Member]
1/4/2008 5:25:33 PM EDT
Some are looser than others, you really won't know until you try a particular RAS on your particular gun. That said if you don't want any movement and don't plan on mounting anything on the top rail you could try mounting it upside down.

MajorAR  [Team Member]
1/4/2008 5:29:28 PM EDT
THREE things in life you CAN NOT go wrong with....

1.) Good PIE
2.) Colt 6920

wreckdiver  [Member]
1/5/2008 7:11:51 AM EDT
Thanks for the advice. Looks like the RAS wins. The only reason I was checking out the Surefire was (a) I could pick one up relatively cheap, (b) doesn't matter if the top rail doesn't line up with the flat top because it would go on the fixed handle A1 9mm AR.
Postal0311  [Life Member]
1/5/2008 7:28:15 AM EDT
First I would suggest the DD Omega rail.

But if you must have a RAS, surf the EE, you will find them rather cheap there. As for how tight the lower rail is. Most I have seen have no noticeable movement. It doesn't really matter on the bottom rail unless you plan to mount a laser on it. I have two, a carbine RAS and a M5 RAS. No problems with either. But I wouldn't buy a new one now that the Omega is out.
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