Vltor MUR Receiver

[steve2071]

Has anyone had any experience with this upper? Performance-wise, is it basically similar to every other run of the mill upper receiver out there? I must admit, it looks pretty cool, though they're sold out everywhere I've looked.

[twl]

Steve,

The VLTOR MUR upper receiver is made from billet and is re-profiled to be thicker and more rigid than a normal AR15 upper receiver.
It also has a removable shell deflector and forward assist, if you feel like you ever need to change that item.

Otherwise, it functions and performs like other upper receivers, and uses the normal screw-on barrel nut method of barrel installation, like other uppers.

Some people claim that the billet method of manufacture will provide more perfect rail specs for the picatinny rail on top.

Also, some people think it looks cool, so that might be a factor too.

[steve2071]

Thanks!

[brando]

I shot one Thursday along with the new VIS upper. It's nice, a lot like an MRP.

[bwiese]

There have been concerns for real precision shooters with run-of-the-mill AR uppers.

Wes @ MSTN says he's seen outta-spec upper receivers from *all* brands.

Most of us will probably not notice the difference, however.

I've heard that some folks with too much hanging off their upper (rail system + flashlight + laser + forward mount red dot optic) have distorted their upper receivers...

[Solidsnake87]

I've heard that some folks with too much hanging off their upper (rail system + flashlight + laser + forward mount red dot optic) have distorted their upper receivers...

This is impossible. All metarials have an elastic limit to which they can flex or bed without permanent deformation. The aluminum used on uppers has an elastic limit of several thousand pounds. The goodies placed on a gun will never warp or distort parts unless they exceed this elastic limit. On a side note, it may be possible for this to happen if your barrel gets red hot BUT precision rifles will not be shot to that point.

[mltrading]

Should be identical to other uppers. The only difference is the look. (The shell reflector and FWD assistant are a little bit different from regular ones.)

I have some MUR but they are still in sealed boxes. Everybody wants one. They are so out of stock.

[Omega13device]

There have been concerns for real precision shooters with run-of-the-mill AR uppers.

Wes @ MSTN says he's seen outta-spec upper receivers from *all* brands.

Most of us will probably not notice the difference, however.

I suspect that Wes is just a very good salesman working hard to sell his new product. He has always had a tendency to trash the old product when something new comes out, even though he had been singing the old product's praises for ages. He was always saying the LMT uppers were the only ones that were straight until the MUR got here and now we're suddenly hearing that all brands had "out of spec" uppers.

Also, he uses the term "out of spec" quite liberally without ever defining it, which makes it sound even MORE like marketing-speak to me.

[mltrading]

I suspect that Wes is just a very good salesman working hard to sell his new product. He has always had a tendency to trash the old product when something new comes out, even though he had been singing the old product's praises for ages. He was always saying the LMT uppers were the only ones that were straight until the MUR got here and now we're suddenly hearing that all brands had "out of spec" uppers.

Also, he uses the term "out of spec" quite liberally without ever defining it, which makes it sound even MORE like marketing-speak to me.

Yeah, that kind of messages are all around. Nobody ever got hurt with "off-spec" uppers.

[steve2071]

Aw Shucks

I hate to bring this dead thread back (beats starting a new one), but after some research I have learned that the MUR, because of its billet construction, fails to properly accept LaRue railed handguards due to a problem with the locking plate not seating correctly between the barrel nut and the MUR. I was wondering if the receiver had this problem with all handguards, or is it confined to LaRue rails?

As you can probably tell, I'm pretty interested in purchasing this upper. But if it's going to limit my options, I'd rather get something a little more standard.

[chuck762]

I hate to bring this dead thread back (beats starting a new one), but after some research I have learned that the MUR, because of its billet construction, fails to properly accept LaRue railed handguards due to a problem with the locking plate not seating correctly between the barrel nut and the MUR. I was wondering if the receiver had this problem with all handguards, or is it confined to LaRue rails?

As you can probably tell, I'm pretty interested in purchasing this upper. But if it's going to limit my options, I'd rather get something a little more standard.

From what I have read and experienced pretty much any that use a anti rotation locking gizmo will need some work to get it to mount up. I have a MUR upper with a Troy rail and I had to machine the locating tabs to fit the MUR receiver. Samson and LaRue need work also. The Troy and Samson took 10 minutes in the mill to open up.

I bought the MUR to replace a out of spec receiver. The rails were too wide and had a tilt machined in. It didn't show up with my Aimpoint but made the Eotech I tried sit at a funky angle. But then again I have other standard forged uppers that are correct. I have to admit I like the look since it is a little different.

[steve2071]

Thanks Chuck!

[mcubed4130]

Hmm... in spite of all the replies... other than this being a more precision piece (better tolerances - maybe), does anyone think it's worth it?

They claim thicker walls - which to me means, stronger - but I mean... when you are comparing to other forged uppers... how much stronger is it? are we talking like normal forged upper can take "X pounds of force before having problems" and Vltor MUR can take "X+1 pounds of force"? or are we saying Vltor MUR can take "X*5 pounds of force by comparison...

I've not found anyone reporting "breaking" their upper...

Are we talking like... SU16 blow up = possible with normal forged Upper vs. Vltor MUR = not going to blow up? The pics on http://www.calguns.net/calgunforum/s...ad.php?t=54284 are very scary. Which got me thinking about exactly how forged a forged upper I want to put on my upcoming OLL build.

-M3

[mltrading]

If your rifle does ever go Kaboom, the strength of receiver does not matter. The power of explosion is able to destroy both aluminum and steel receivers.

[bwiese]

Hmm... in spite of all the replies... other than this being a more precision piece (better tolerances - maybe), does anyone think it's worth it?

For most mortals, no.

I may get one just to play with for one of my reg'd AWs for the helluvit.

I might consider it for a kinda-sorta 'match' gun.

Some out-of-spec upper rcvrs are not necessarily concentric or have bolt carrier fit with the appropriate snugness (i.e, a bit of 'bolt carrier slap'). This is why you don't buy from a bottom feeder.

Any AR can blow up with out-of-battery firing, wrong powder or too much powder on reloads, etc.