VLTOR MUR Assembly?

AR/M4 AR Technical Discussion
1

How is the FA/deflector attatched to the MUR? Basically…is it solid…will it contain pressure from a case-rupture…does it wiggle…etc.

I saw a post a while back where someone was complaining about the difficulty of getting the ejection-port cover off for replacement with a laser engraved version. Is the MUR different this this respect as well from a standard upper?

ETA: I just went to their website and Vltor advertises the MUR as having Type II anodizing. Why the hell would they spend the time to make such a “strong” upper just to give it decorative anodizing? Wierd. Multi-piece beauty queen anyone? Not liking this : /

2

If it’s a problem, the LaRue, Sun Devil, Rainier, and MEGA offerings are certainly out there - I’d go with any of those if you’re concerned.

3

The assembly is dovtailed into the upper. A roll pin holds the unit from sliding out ( towards the back of the upper )

The reason someone said that it was difficult getting the ejection port covers off was because it requires you to remove the FA / deflector module . Its easy to put the pin on backwards ( like a traditional AR where the extra length goes towards the muzzle ) When you do this with a MUR the pin slides out of the hole on the left side of port cover.

I found this out the hard way !

I have no reason to doubt that it could handle pressure like a tranditional upper. Even though the module lookes relatively large, the upper reciever only has a small window that the forward assist passes through to so you have the forged reciever walls holding it together…not the forward assist / case deflector module

This module is precisely machined to fit into the upper with a dovetail. The two I have exhibit no play

See pics below

The MUR is machined from a pretty beefy forging ( current models are forgings )

Left to right we have the Sun Devil, a RRA standard flatop, Vltor. You can see the module sits ON a heavy wall forging . Top view shows how much the module protrudes

Notice the ejection cover hinge pin protrudes to the RHS on the Sun Devil ( and traditional uppers ) . The Vltor it goes the other way.

4

THANKYOU! I see, I SEE! Awesome pix. All I could find were from like 3 angles, over and over again, none showing how it went togather.

5

It’s a total piece of cake to remove and replace it. I did mine no problem to install my dust cover door, as seen here:


6

it’s a typo. they’re type 3 hard coat anodized.

7

Whoes ejection port cover is that?

8

They have some like it here:http://www.harengser.com/store/proddetail.php?prod=AR15_EJ_Gadsden

9

Ah, gotcha! Thanks!

10

Does anyone know the weight diff between a VLTOR MUR stripped upper with FA as compared to a standard one like a DD M4 stripped upper? I am going to step out on a limb here and speculate that the diff is 1.5 ounces.

By the way, the SUn Devil is sweet looking also. I want both. It’s a good thing AR15s are cheaper than sports cars. :slight_smile:

11

10 ounces with the FA and deflector. Basic flat top uppers with FA and ejection port cover are 8 to 8.5 ounces, so good guess! :slight_smile:

12

Thank you!

13

Does the Vltor MUR block use a roll-pin common to another in the AR, or must they be individually sourced, and if so, can this be done? Will Vltor sell just the pin?

I have read that one person who had their MUR fall apart because the pin walked out claims it does not look like the pin could be pounded out to the inside of the receiver because the pin was too long to allow for this. Is this true? How is it removed?

Wishing Noveske did not use oddball stuff like the MUR. Love their uppers but this MUR is giving me pause. Is it often that they fall apart?

14

So because one person reported something you are concerned? Do you think that Noveske would use them if they were shit?

Don’t you think that Vltor would have issues and there would be mass internet hysteria if they were crap?

15

Negative, hence my inquiry into the frequency of this.

16

WS6,

From your post:

I have read that one person who had their MUR fall apart because the pin walked out claims it does not look like the pin could be pounded out to the inside of the receiver because the pin was too long to allow for this. Is this true? How is it removed?

Wishing Noveske did not use oddball stuff like the MUR. Love their uppers but this MUR is giving me pause. Is it often that they fall apart?

This implies that you are concerned even though you clearly state that it has happened to one person. I asked you if Noveske would continue to use them if this was an issue or would Vltor in fact keep making them if they were crap. Again, based on your own post it does seem as if you are concerned.

I would contact Vltor directly and pose your questions. All the people that I know that have them have been very happy with them. Does that mean that this “person of one” didn’t get a lemon? No. But, it stands to reason that if this was an issue you would be seeing more of it on the net.

17

Will pose questions directly to Vltor. Thank-you.

18

Those billets aren’t even in the same galaxy as the MUR.

19

I presume you mean that the MUR is superior? How is it superior to the LaRue?

I presume you have no issue with the MUR holding the FA in-place with a single roll-pin, and I know you run your stuff hard.

20

The MUR is infinitely superior.

LaRue is surely machined well… But it’s a billet. And even the best billet will never have the strength of a forging. Plus the multi heat treatment of the MUR makes the material even better than a mil spec forging.