wobblinwheel Posted February 8, 2014 Report Share Posted February 8, 2014 Does anybody have the longer (M16 or "s.p.r.") Colt/Umarex "R.I.S." rail interface system, in other words, quad rail foregrip, that you want to get rid of? I've got the shorter carbine version to accomodate the sight, but I want to remove the sight and have the rails extend to the back end of the "compensator" that I have on there. The Umarex one should screw right onto the threaded barrel nut I already have. I have some good stuff to trade for one, or will pay a reasonable price, if not too "spensive". Don't need barrel nut or rail covers that it comes with. Quote Link to comment Share on other sites More sharing options...
techmike Posted February 11, 2014 Report Share Posted February 11, 2014 Can't help you, mine was the M4 version. I put one of THESE on my Colt. Any of the air soft rails will fit the Colt. Mine is very high quality, no complaints.TM Quote Link to comment Share on other sites More sharing options...
wobblinwheel Posted February 11, 2014 Author Report Share Posted February 11, 2014 TM, any chance you know whether or no yours will thread onto the Colt's external barrel nut threads that came with the Colt RIS? I would like to thread mine on without removing the nut. Quote Link to comment Share on other sites More sharing options...
techmike Posted February 11, 2014 Report Share Posted February 11, 2014 It comes with a new nut, the Troy rail does not thread on - slips on, twist it & then tighten two screws to lock it down. You can view pics of my install HERE. The Colt's OEM nut has two flats & comes off with a big adjustable wrench, I had a nut socket that fit the Troy's nut, but you can also use a standard AR15 armorer's wrench to tighten it. TM Quote Link to comment Share on other sites More sharing options...
wobblinwheel Posted February 11, 2014 Author Report Share Posted February 11, 2014 I looked at your install pdf and noticed you have the Colt "compensator". I do too. Does it fit inside the rail without making contact? Definitely need to keep things "free-floating" on this rifle! Quote Link to comment Share on other sites More sharing options...
techmike Posted February 11, 2014 Report Share Posted February 11, 2014 I turned down the comp about .005" on the last 1.5" of the back end. Fits better, it was tight. I am running the original flash hider now.TM Quote Link to comment Share on other sites More sharing options...
wobblinwheel Posted February 13, 2014 Author Report Share Posted February 13, 2014 I found one online from "Woodbury Outfitters". It is the original Colt/umarex part #2245113 for $103.99. This one should screw directly onto my existing barrel nut. The one I have on there is the Umarex one that is "carbine length". This one should be the same, except longer. This one also goes over the "compensator" with plenty of clearance. I just didn't really want to spend this much money on it, but comparatively speaking, I guess it's not such a bad deal. I would surely like the idea of a "quick-change" setup! Quote Link to comment Share on other sites More sharing options...
dan01 Posted February 14, 2014 Report Share Posted February 14, 2014 I put a 4 rail foreguard on my Umarex Walther Colt M 4 carbine with the D ring (6 3/4") $53..... Quote Link to comment Share on other sites More sharing options...
wobblinwheel Posted February 14, 2014 Author Report Share Posted February 14, 2014 Don't have a "d ring". Have the externally-threaded Colt barrel nut. Quote Link to comment Share on other sites More sharing options...
techmike Posted February 14, 2014 Report Share Posted February 14, 2014 Some of the Colts came as "tactical", they have a free-float hand guard. I just found a 15" Troy Alpha rail on Amazon. With that on, the flash hider will just barely stick out. :grin: Quote Link to comment Share on other sites More sharing options...
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