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Thread: How much practical difference does a MUR receiver make?

  1. #11
    Join Date
    Mar 2010
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    It will work for you.

    And, I do plan to replace my Knights uppers with VLTOR units, due to POI shift, and accuracy potential.
    We miss you, AC.
    We miss you, ToddG.

  2. #12
    Join Date
    May 2010
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    My most current upper is running Vltor MUR with a DD RIS-II. I bought one of the sterile MUR-A1s from Vltor's website. It didn't have any of the large logos or writing on it. Just a very classy and subdued one under the ejection port.

    The alignment between the MUR and DD RIS-II is perfect. Much better than any rail/upper combo i've owned. There is absolutley no step or transistion between the MUR and RIS-II.

    I think this speaks wonderfully about how dimensionally perfect the MUR is.

    I've had uppers from CMMG, Daniel Defense, Noveske and of course Vltor. The rails i've used have been mostly Troy and DD products, with limited experiance with KAC (old type) rails. Daniel Defense rails, in particular the RIS-II is by far my favorite rail.

    The MUR has slightly more heft to it, but between a stainless barrel and a vari scope, the weight of the MUR is on the low end.

    I had sent a few emails back and forth with Wes Grant from MSTN about uppers. I had been wondering about lapping an upper receiver and bedding a barrel. If these two things were even worth it or necessary.

    Wes had said he seen the quality of typical forged uppers vary quite a bit, and he has always found the Larue and Vltor uppers to be dimensionally perfect. So when it came to lapping, a better solution was to start with an upper than was already perfect.

    I think there is something to having a true upper receiver. When using the MUR, my zero was about two clicks off on windage from mechanical zero. I haven't done any before and after testing, but i've always needed a few more clicks to get zeroed before.

    The other thing I like about the MUR is how tightly it fits to the barrel extension. I've had a couple of uppers whereas the barrel had quite a bit of play in the upper. Granted this was without the barrel nut torqued, but in trying to build a precision rig, I was less than satisfied with a sloppy fit. I actually had to put a bit of effort into getting the barrel to seat in the MUR.

    After using a Vltor MUR, I would only build an upper using them for anything close to a precision-ish upper.

    As to the added expense....I think it would depend on what you are using the rifle for. If its just going to be something you're going to mount a T-1 on and take to a class, then I don't see how much of an advantage it would be.

    In my case, spending a shit ton of money on a scope, I want every possible part to be as perfect as possible. So if you are willing to drop upwards of $2k on a scope, the extra $100 on the upper is peace of mind in the very least.

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