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Posted: 6/22/2009 6:22:35 PM EDT
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on a M4 type 16" barrel. I have been searching all day and still dont know the difference.
Anyone? 
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The RIS and RAS units are similar in that they consist of two major components: a top component consisting of top, left, and right quadrants, and a bottom component consisting of a bottom quadrant. Each quadrant contains a MIL-STD-1913 rail that can be used to attach a variety of weapon accessories. Differences between these two units occur in the way that they attach to the handguard cap and delta ring/barrel nut, how the units are numbered, and the types of barrels that they can be used with.
Rail Interface System (RIS) (KAC P/N: 94297) The RIS is the older version of the two systems and is numbered T-L-R-B (top- left-right-bottom) in odd numbers 1 - 13 beginning at the front sight and ending at the upper receiver. The RIS system works with a wide variety of barrel contours and mounts like a conventional handguard except for an adjustable metal tab, at the handguard cap, that squeezes the two halves together. At the rear, the RIS unit is held in place by the delta ring. The biggest advantage with the RIS system is that it is able to accommodate a wide variety of barrel profiles while the disadvantage is that the RIS doesn’t clamp to the weapon as solidly as the RAS system. Just the same, the Navy SEALS reportedly prefer the RIS over the RAS system for the advantages described above. |
| I suppose I'll be the guy to bring it up, I have a colt MT-6731 with a HBAR and, I had no trouble getting the RAS to fit over the bbl. Most of the problems that have come up in the past were caused by the bolt on the top of the RAS not being FULLY removed(just loosened) when installing. I know there are quite a few others around here that have been able to get the RAS over their HBARs... but I have noticed they have mostly been Colts.... could just be a huge co-incidence... but ehh.. |
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