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Posted: 4/19/2003 1:12:42 PM EDT
| Read the report above and have decided to get the S.I.R. system. I was wondering what the major diffrence between the civy and mil version was. Is one stronger/lighter or in anyways diffrent than the other? Also does anyone know if it will fit on a Model 1 A3 car flattop upper with welded muzzle brake? |
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Quoted: Read the report above and have decided to get the S.I.R. system. I was wondering what the major diffrence between the civy and mil version was. Is one stronger/lighter or in anyways diffrent than the other? Also does anyone know if it will fit on a Model 1 A3 car flattop upper with welded muzzle brake? I don't feel you should be concerned with any strength difference between the -C or -M model SIR. To me, the key factor in the strength of the system is the yoke around the barrel nut, and they both use it. The -C is made to install with a coin or screwdriver and loctite, no parts removal expect for your old handguards. To install the -M, you remove the delta ring components either by pulling the barrel or cutting them, like some board members have done. ARMS only guarantees fit on Armalite, Bushmaster, and Colt AR's. Whichever model you choose, you'll be impressed. Chris |
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You're goin to love it. If you're not super anal, and want to save a buck, there IS a board member selling a SIR M rail for $330 shipped!! [URL]http://www.ar15.com/forums/topic.html?b=7&f=25&t=162958[/URL] (I am not vouching for the seller or the product, just mentioning a link I saw) The one dented 'ear' he mentioned really won't affect you unless you care that much, and plan on running THREE items at once; otherwise, one of the other two rails that come with the SIR will do fine. You can mount them anywhere on the SIR body you see fit. There is no discernable difference in strength; They are the functionally the same, except right where the upper half meets the upper receiver, the M model is cut less agressively, with a slant that comes up and covers the front edge of the upper. The C model starts it's 'cut' further forward on the upper, but leaves a 'hollow' area for the delta ring. Unless you regularly wrench your rifles yourself, I would say get the C model. In that way, if you ever want to sell the upper you have, barrel and all, it's not an issue that you had cut the delta ring off just to make the SIR-M fit. Because the yoke is the same for both models like mrcr mentions, the lack of material around the delta ring area on the C model is no different than the extra M model's upper half material that fills that void once the delta ring is cut off. In essense, they both form 'triangluar assemblies' connecting the bottom of the lugged barrel nut,(same exact point on the rifle regardless if you have a delta ring or not) the junction point of the yoke to upper SIR half, (which will be in the same spot, since the yoke is identical between models) and the weaver rail connections on the flat top. (also going to be identical on both models, obviously) ..and yes, I'm not only an SIR advocate, I'm an owner. [:D] [IMG]http://www.matt-sherman.net/elmo/AR15.jpg[/IMG] Only one tip and piece of advice; DEFINITELY USE THEIR LOCTITE. DO NOT USE 'regular red'; it's not made for aluminum threads, and you could ruin the SIR if you're not careful. If you purchase used and do not get a tube with it, either call atlantic, or let me know, I will get you the 'loctite number' that is appropriate for aluminum threaded items so you don't destroy your investment. [:)] Good luck, you're going to love this thing. E. |
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No arguement there; it does tilt the ring slightly, top of the ring 'forward' It really does nothing functionally. it's purely a minor comestic, and barely noticeable at that. It's caused bt the yoke, being inserted between the bottom lugs of the barrel nut only, and then the delta ring pressing up against it. There is no 'yoke' up top on the top half of the lugs of the barrel nut, so the ring leans forward and closer to the lugs. Voila, there's the lean. If it bugs you, get the M model. [;-)] [:D] E. |
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Quoted: the only thing wrong that I have found w/ the "C" model is that some people have complained about how the S.I.R. puts the delta ring at a weird angle... In fact, there was a thread on this subject (I think you're referring to it?). [b]NEPAshooter[/b] posted an excellent explanation. Chris |
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