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Thread: Help me build something better than a KAC SR15 14.5" upper

  1. #51
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    looks like I'll be going the mod 1 route since the gas port is too big for the urx 3.1

  2. #52
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    Quote Originally Posted by Failure2Stop View Post
    Lasering on the left side of receiver.
    Gas block relief cut in the URX4.
    The gas block and gas tube retainer nut look correct, but can't say for sure.
    Together, the upper gives a strong impression of being correct.
    What is the cut near the receiver end of the rail above the QD attachments? I guess this version of the URX4 13.5" will only be on factory MOD 2's?

    Also I had heard the gas tubes are 'straight' on the MOD 2's, is that correct?

  3. #53
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    Quote Originally Posted by phaseshift View Post
    looks like I'll be going the mod 1 route since the gas port is too big for the urx 3.1
    I think you mean gas block.

    In most cases you could probably just swap the gas block for one that fits under the rail, but with the proprietary MOD 2 type gas block I don't think that would be the case. The URX4 is not to shabby in my opinion, but it's your gun.

  4. #54
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    Quote Originally Posted by Failure2Stop View Post
    Lasering on the left side of receiver.
    Gas block relief cut in the URX4.
    The gas block and gas tube retainer nut look correct, but can't say for sure.
    Together, the upper gives a strong impression of being correct.
    Thank you, appears you are correct. I didn't see the picture of the left side of the receiver.

  5. #55
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    Quote Originally Posted by col.1981 View Post
    What is the cut near the receiver end of the rail above the QD attachments? I guess this version of the URX4 13.5" will only be on factory MOD 2's?

    Also I had heard the gas tubes are 'straight' on the MOD 2's, is that correct?
    Yes. Not promoting, just best pics I've seen of the gas system disassembled: http://www.smallarmsales.com/knights...ong-handguard/

    The URX 4 that comes on mod 2 is 14.5" long.

  6. #56
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    Quote Originally Posted by hjmpanzr View Post
    Yes. Not promoting, just best pics I've seen of the gas system disassembled: http://www.smallarmsales.com/knights...ong-handguard/

    The URX 4 that comes on mod 2 is 14.5" long.
    Thanks for the link to the photos. It's a very interesting design.

    My mistake on the rail length, meant to say 14.5".

  7. #57
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    Still considering the SR15 16" cut down and dimpled by Marvin, but also still open for alternatives. Generally everyone says these things about the SR15 "well balance", "light", "softest shooting AR", "accurate" can we build a custom upper that does the same? Lets come up with a custom upper that can rival an sr15...is it possible? What do you guys think?

  8. #58
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    Did... you even read the thread?

    Hint: start here
    Last edited by Zim; 08-27-14 at 23:42.

  9. #59
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    Quote Originally Posted by phaseshift View Post
    Still considering the SR15 16" cut down and dimpled by Marvin, but also still open for alternatives. Generally everyone says these things about the SR15 "well balance", "light", "softest shooting AR", "accurate" can we build a custom upper that does the same? Lets come up with a custom upper that can rival an sr15...is it possible? What do you guys think?
    BCM mid-length 14.5" w/ KMR + Vltor A5 might do the trick...

  10. #60
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    Quote Originally Posted by scooter22 View Post
    BCM mid-length 14.5" w/ KMR + Vltor A5 might do the trick...
    That is a sweet setup. I have a 16" middy with an a5 and I think its just as smooth as my sr15. Get the elw barrel and it'll really balance out.
    Last edited by VIP3R 237; 08-27-14 at 23:50.
    I paint spaceship parts.

    Quote Originally Posted by Failure2Stop View Post
    Stippled Glocks are like used underwear; previous owner makes all the difference in value.

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