Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 32

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

  1. #21
    Join Date
    Oct 2009
    Posts
    31
    Feedback Score
    2 (100%)
    I have a Vltor VIS-I (carbine length) and I'm very satisfied with my purchase.

    When I first decided I wanted to get into AR15's a few years back, right when obama paranoia was hitting full swing, I put a lot of time researching different types of builds, my concern being that the first AR15 I bought could have been my last. Luckily things didn't get too bad and there is no AWB these days.

    I decided pretty early on that I wanted a continuous top rail, and my main contenders were the Vltor and LMT as one-piece designs, and then the KAC URX, Troy MRF rails, and DD Lite rail. I ultimately chose the Vltor because it uses non-proprietary barrels, and the lower section comes off for cleaning. Another big deciding factor was that the VIS is available as an option from Noveske.

    In the year+ I've had the VIS upper, I've been very pleased with it. It is definitely a little bit wider then some other rail systems I have encountered, so I use it with magpul ladder rail protectors to keep the package a little bit slimmer, and I havent had any problems with heat.

    As mentioned above, the only part I dislike is the lack of QD Sling cups. Seems like they could have figured out a way to add them where the rail tapers into the receiver part.

  2. #22
    Join Date
    Mar 2010
    Location
    TN
    Posts
    236
    Feedback Score
    6 (100%)
    i love my vltor vis midlength it came with my noveske its great i would go with that
    Last edited by Ratfink; 03-28-10 at 19:52.

  3. #23
    Join Date
    Dec 2009
    Location
    College Place, WA
    Posts
    54
    Feedback Score
    19 (100%)
    My Vltor VIS works great with my PWS short stroke piston system, so don't write it off if you want a piston system.

    I will be curious to see if it will work with Addax's new enhanced short stroke sytem.

  4. #24
    Join Date
    Nov 2009
    Location
    The Republic of Texas
    Posts
    36
    Feedback Score
    0
    I've discovered a couple more bits of info concerning this in the last few days:

    1.) The Mega is manufactured from 7075-T6 whereas the Vltor VIS is 6013-T6.

    2.) The Vltor VIS enables you to go with a pinned gas block (like on the Noveske Light Reece VIS 16" Upper). The Mega must use a low-profile set screw type gas block if you want it to go underneath the hand guard.

    Also as stated by boltcatch in Reply #3, the Vltor offers a single aluminum heat shield inside of the removable lower portion of the hand guard. The Mega does not offer an additional heat shield.

    How important is the difference in construction material??

    Realistically, if set screws have loctite and are possibly staked (does anyone ever do that to gas block set screws??), should I ever have any concerns about the gas block loosening up over time??

    How big of a concern would it be to not have heat shields incorporated into the rail?? I don't believe LaRue or DD have heat shields and these products are top-of-the-rock.
    "Eternal vigilance by the people is the price of liberty... You must pay the price if you wish to secure the blessing." Andrew Jackson

  5. #25
    Join Date
    Jul 2006
    Posts
    2,705
    Feedback Score
    0
    Quote Originally Posted by LMTRocks View Post
    LMT does not offer what alot of people want in barrels: a 1.10 6.8? no using SSA combat loads.
    Sigh. When the military went from 1:12 to 1:7 there was only minimal increase in chamber pressure and did not prove to be significant when even shooting hot NATO ammo. But that did not stop some from saying the sky was falling. And now we all want 1:7 barrels. That should snap people back to reality. 6.8 is not so special as to have its own rules.

    No one has shown that 1:10 twist, by itself, leads to significantly more pressure than 1:11 or 1:12. It seems the reason why people mention 1:10 barrels as an issue is because a lot of early 1:10 barrels happen to have shorter chambers and tight bores - not that 1:10 is in itself a problem. Very likely LMT and LWRC 1:10 barrels are very good - though I would want to know:

    SAAMI or SPC-II chamber?
    Match chamber or one with some room?

    I would look for a barrel which says it has a high reliability chamber rather than a match chamber.
    Last edited by rsilvers; 07-11-10 at 19:28.

  6. #26
    Join Date
    Aug 2006
    Location
    UT
    Posts
    4,596
    Feedback Score
    0
    If I were buying a monolithic upper, I'd get LMT first, and VLTOR second

    I dont know enough about the Mega upper to have an opinion about it, but it still wouldn't be my first choice
    Kein Mitleid Für Die Mehrheit
    What Happened to the American dream? It came true. You're looking at it.

  7. #27
    Join Date
    Jun 2008
    Location
    Edmonds, WA
    Posts
    1,845
    Feedback Score
    1 (100%)
    The finish on the Mega seemed to be the same finish that was on my current Mega standard upper receiver. While the finish is pretty tough and resistant to chemicals, I do not believe it stands up to physical abuse as well as normal mil-spec finish. My top rail is showing a lot of wear from my optics, finish is chipping off down to bare metal. This does not appear to be unique to my particular upper, because another upper built out of that model receiver also has the same problem. I have considerably less of a problem with my Colt, LMT, and BCM uppers.

  8. #28
    Join Date
    Mar 2008
    Location
    Fredericksburg, VA
    Posts
    4,859
    Feedback Score
    7 (100%)
    Quote Originally Posted by EzGoingKev View Post
    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.
    No, there is no mil-spec for outside-to-outside dimenstions of a rail system as a whole, as it bears no impact on whether or not a rail interface does or does not fit on a rail section. The spec is all about the rails themselves, as they absolutely have to be uniform.

    The only thing the outside-to-outside dimensions would mechanically affect would be the offset of a given device from the bore, based on where you decided to put it. The lateral offsets for a side-mounted laser, for instance, that you find in a given device's TM or in the TM for the LBS would be different on a DD rail, given that the offsets in the books are all based on KAC rails.
    Contractor scum, AAV

  9. #29
    Join Date
    May 2010
    Location
    midwest
    Posts
    8,217
    Feedback Score
    4 (100%)
    Quote Originally Posted by Southern_Partisan View Post
    I was planning on going with either a mid-length BFH Noveske or BCM barrel.
    Note that Noveske sells barreled VIS uppers. Also be aware that when Noveske ships you a barrel, they pin the gas block on and apparently getting that bugger back of to install the VIS barrel nut can be quite an ordeal. If you order a barrel from Noveske for a VIS, consider asking them to leave the gas block unpinned.



    Quote Originally Posted by Southern_Partisan View Post
    As mentioned above, the only part I dislike is the lack of QD Sling cups. Seems like they could have figured out a way to add them where the rail tapers into the receiver part.
    I use Gear Sector QD mounts, which are the same profile as an XTM rail cover.

  10. #30
    Join Date
    Jan 2010
    Posts
    621
    Feedback Score
    0
    My personal vote is Mega. I own that one but considered the Vltor. I didn't go with that one because there are actually a lot of parts that go into that upper! I personally just wanted ONE piece the Vltor has many....

Page 3 of 4 FirstFirst 1234 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •