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11/14/2004 2:49:13 PM EDT
My first time posting, but I've come to respect the knowledge and experience here. My dilemma is that I'm having trouble deciding on which SIR system to get; the rifle length or carbine. I have both AR's.  My opinion is that the rifle length would serve me better, as the 20" has better range and lethality (again my opinion), and free floating it would hopefully bring out some of it's accuracy potential, although the barrel is a gov't profile, chrome lined, 1x9. I'm curious as to just how durable and rugged the SIR is. BTW, the rifle is my "woods' gun, carbine is my "urban" AR, (I do live in a large city, unfortunately)
   My other argument with myself is that for my needs, free floating a 14.5" barrel is pointless, because the ranges I would use it would be short, 25m-150m. But I admit that it looks pretty damn cool.  
   I use the rifle more though. (ok, ALOT more). I would just like to know any actual experiences anybody may have with them, suggestions, and any pictures. I seen a few pics on the AR pic board, but don't recall seeing that many SIR's. If this is a redundant topic, I apoligize in advance.
 Oh yeah, getting both is not an option.  
11/14/2004 2:59:27 PM EDT
[#1]
A Daniels' Defense or Larue rail would be cheaper and lighter.  I have used the DD and the SIR, and I like the DD better; it's what I use on my M4.
11/14/2004 3:08:58 PM EDT
[#2]
I have the carbine length 45M. I love it personally, and it's sturdy as hell and you don't have to take the front site off to put it on. As for whether to get it for the rifle or carbine, I'd get it for the carbine. IMO, 20 inch rifles are for longer range shooting, and thats about all they are good for. A 16" carbine will do everything the 20 will do, and do it with less weight and an easier to handle package EXCEPT for the long range shooting. For the rifle, IMO, all you really need is a bipod and a scope for the flat top to use it's only advantage over the carbione. Lights and other general CQB accessories has little use on 20 incher(unless it's your only ar :)). Personally, I'd get a cheaper free floated forend for the rifle, and splurge on the SIR for the carbine where having all the rails will be of more use. Definetely though, the rifle needs to be free floated but there's cheaper and lighter ways to do it than with the SIR that will be just as good for it's application. Hell, it doesn't even need to be a railed forend either, just a free floater with a swivek stud for the bipod. Just my opinion though, and as I'mn sure you've seen, this board has alot of those and no two are the same.
11/14/2004 3:21:08 PM EDT
[#3]
Based on your criteria, go with a #59C SIR.
11/14/2004 3:22:29 PM EDT
[#4]
Thanks for the ideas so far. Keep em' coming.  I forgot to mention that I have KAC rifle length rails on my rifle now. It's also an A3 upper. I kinda have it in M16A4 config.  My carbine is a basic A3, with nothing on it as we speak. (hopefully soon to change)  The carbine length sounds like the way to go, but I would still like to take on coyotes at 300 yds. Not sure what I could get out of 16" of barrel ??  (edit) The #59c is rifle length, right? ( no ARMS catalog nearby)
11/14/2004 3:37:32 PM EDT
[#5]
i have the 46c and the 50c both of which i like very much.  very simple install and sturdy.

i also have the yhm and planning to get the larue next
11/14/2004 5:05:45 PM EDT
[#6]
Come on guys, help me out here . . . Are they prone to rust? (important in LA) How do they hold up when accidentally beaten around?  How much has it helped accuracy and barrel cooling?
11/14/2004 5:15:06 PM EDT
[#7]
I installed a bunch of the SIRS on the Barrett 6.8 rifles. I don't like the SIR. It feels like you are holding a 4x4 piece of wood. Try to find someone with one of the comparable fore ends that are thinner, I bet you will like them much better.
11/14/2004 5:19:48 PM EDT
[#8]

Quoted:
Come on guys, help me out here . . . Are they prone to rust? (important in LA) How do they hold up when accidentally beaten around?  How much has it helped accuracy and barrel cooling?



It won't rust (aluminum) and as near as I can tell it holds up very well. Never shot for groups with it though. Barrel still got hot, I couldn't tell the difference though, I didn't have instrumentation and too hot to touch is too hot to touch, even if its 200 degrees with the SIR and 500 without.

It is kinda like a 2x4. The plastic bottom piece doesn't feel solid either, particularly with a VFG.
11/14/2004 8:13:41 PM EDT
[#9]
didnt see that you asked about rusting. no it doesnt rust upper is park alum and lower is plastic.

11/15/2004 9:41:58 AM EDT
[#10]
I use a VFG too, and I've never felt the plastic not being "solid".  In fact, I don't think any railed carbine should be without a VFG so this whole "feels like a 4x4 peice of wood" thing is BS in my mind. Before I could afford the VFG, my wife shot my rifle with no complaints, so some of you guys must have some girly hands or are  just accustomed to handling your pencil sized peckers Personally, I think it feels fine, especially with some decent shooting gloves.
11/15/2004 10:12:03 AM EDT
[#11]

Quoted:
didnt see that you asked about rusting. no it doesnt rust upper is park alum and lower is plastic.




Note: Aluminum can't be parkerized (you'd destroy the AL) it is annodized which is a different process.


Why go with the SIR when you can get a Troy MRF?  The MRF installs just as easy, it's lighter, less expensive, doesn't raise the heigh of your rails, you can use ANY BUIS with it, and it's all aluminum (no plastic).  
11/15/2004 10:28:20 AM EDT
[#12]

Quoted:
I use a VFG too, and I've never felt the plastic not being "solid".  In fact, I don't think any railed carbine should be without a VFG so this whole "feels like a 4x4 peice of wood" thing is BS in my mind. Before I could afford the VFG, my wife shot my rifle with no complaints, so some of you guys must have some girly hands or are  just accustomed to handling your pencil sized peckers Personally, I think it feels fine, especially with some decent shooting gloves.



I used it with no bottom rail and it was OK, but I prefer the DD rail. The plastic on mine flexed when I had my M900A on it.
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