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Thread: Request Your Opinions on Monolithic Uppers: Vltor vs Mega

  1. #11
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    Quote Originally Posted by Southern_Partisan View Post
    Vltor VIS

    2.) MilSpec dimensions and tolerances
    I have a question on this. I know that when people talking about the rails being milspec they are talking about the dimensions on the individual rails.

    I see this pic on military morons -



    They are comparing a VLTOR upper to a LMT upper. You can clearly see that the overall dimensions of VLTOR upper are wider than the LMT. When it comes to the overal dimensions what is considered "milspec"?

  2. #12
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    Last edited by 87GN; 03-27-10 at 19:39.

  3. #13
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    That is only the dimensions of the rails sections. I am talking about overall width.
    I found this comparison of DD rails here -



    Is there a standard or norm on the overall height and width? There is a fairly recent thread in which the OP is asking if a LaRue rail is worth the extra money over a YHM rail and one thing I saw several user complain about in regards to the YHM rail is that they are wider than the LaRue rails which made wrapping their hand around them an issue.

    You can see in the comparison pic and see the VLTOR is much wider than the LMT and was wondering about having issues gripping it.
    Last edited by EzGoingKev; 03-27-10 at 21:35.

  4. #14
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    You asked what dimensions are "mil spec".

    Those are the only dimensions that are "mil spec".

    If you want to know what width rails are used by the military, then the KAC RAS and DD RISII are a good place to start.

  5. #15
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    Quote Originally Posted by 87GN View Post
    You asked what dimensions are "mil spec".

    Those are the only dimensions that are "mil spec".

    If you want to know what width rails are used by the military, then the KAC RAS and DD RISII are a good place to start.
    Actually I was asking if there is a "mil spec" that included the overall width and height, not just the rail sections.

    I measured my LaRue and it comes in at 2" wide x 2.120" wide. I wonder how the VLTOR measurements compare.

  6. #16
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    well for one thing LMT proprietary barrel mega barrel of your choice.
    VIS not real monolithic and forged. Mega billet!
    Mega Hex back design stronger for wildcat rounds.....
    PRICE MEGA
    Mega accepts piston kits.... VIS, LMT, COLT...nada

    MEGA WINS IN MY BOOK

    Quote Originally Posted by d90king View Post
    Any reason you aren't considering the LMT MRP? They make a rifle length mono upper also...

    Out of the two you asked about I would say the VLTOR but I have also read a couple positive reports on Mega... The VLTOR simply has a longer history and a good one at that.

  7. #17
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    Quote Originally Posted by znztivguy View Post
    VIS not real monolithic and forged. Mega billet!
    I've read a ton of posts here regarding forged vs billet, and many have pointed out that billet had to be made thicker to equal the strength and stability of forged because the hammering process makes forged denser and more uniformly aligns the molecules.

    Some have also expressed concern about billet in that if the metal was not properly stress-relieved it could warp after machining. I specifically asked the gentleman at Mega about that very thing and he stated that they "machine these from a solid block of 7075-T6 stress-relieved aluminum plate." That was good to hear and sounds as if Mega is committed to doing things the right way.
    "Eternal vigilance by the people is the price of liberty... You must pay the price if you wish to secure the blessing." Andrew Jackson

  8. #18
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    Quote Originally Posted by znztivguy View Post
    well for one thing LMT proprietary barrel mega barrel of your choice.
    VIS not real monolithic and forged. Mega billet!
    Mega Hex back design stronger for wildcat rounds.....
    PRICE MEGA
    Mega accepts piston kits.... VIS, LMT, COLT...nada

    MEGA WINS IN MY BOOK
    The VIS is forged, then CNC machined. How is this bad?

    What sort of engineering study have you completed or seen to determine the strength of each receiver?

  9. #19
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    Quote Originally Posted by znztivguy View Post
    well for one thing LMT proprietary barrel mega barrel of your choice.
    VIS not real monolithic and forged. Mega billet!
    Mega Hex back design stronger for wildcat rounds.....
    PRICE MEGA
    Mega accepts piston kits.... VIS, LMT, COLT...nada

    MEGA WINS IN MY BOOK
    Umm, LMT has a piston conversion and has had one for some time now....
    http://www.lewismachine.net/product....c84aa8a6e6bc03

  10. #20
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    Quote Originally Posted by d90king View Post
    I think there is some merit to the barrel discussion, however personally I don't see a downside when LMT offers the options of any barrel that you could want in the future. I also like being able to simply swap the bolt and barrel and convert to 6.8... I also prefer the barrel profile but that once again that is simply preference.

    I am a little bias because I run two MRP's and have been very pleased with the rifles. YMMV Noveske and BCM are both excellent choices too...
    LMT does not offer what alot of people want in barrels: a 1.10 6.8? no using SSA combat loads.
    I also do not shoot 5.56 anymore because I prefer bigger bullets----I have a newly built 7.62x39 AR where the spent brass will be hydroformed to feed my 6.5 Grendel. If LMT made the MRP in those calibers it would be awesome. You can go to spikes for a 9mm MRP barrel, but given that option I'd love to see a .357sig MRP.
    30 caliber junkie.

    God Bless America.

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