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  1. #1
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    Forward Controls Design URF v2 now shipping

    Built on our first upper receivers, URF v2 and URF-S v2 (no forward assist) incorporate the following changes:

    1. LMT MARS lower receivers compatibility
    2. Over pressure relief vent.

    URF v2 can be found on our site: http://www.forwardcontrolsdesign.com...n-v2_p_98.html

    The over pressure relief vent is drilled diagonally from below the shell deflector. When a round is fired, gas is routed through the gas tube, enters the carrier and impinges on the bolt and its gas rings. As the carrier and bolt travel rearward in recoil, gas is vented through the carrier’s gas ports, and continues to do so past the ejection port. At this point, since the carrier’s gas ports are now masked by the receiver, they vent gas into the upper receiver. Gas seeks a way out of the upper receiver, typically through the gap in the forward assist and forward assist housing, and in between the upper and charging handle. The over pressure relief vent provides a better (larger opening than the others) and more direct path, the path of least resistance, for the gas to be evacuated elsewhere.

    The over pressure relief vent doesn't aim to redirect all gas to be vented through it, it does aim to decrease the volume and velocity of the exiting gas through all openings the pressurized gas will find. The relief vent is tapped and can be closed off by way of a set screw (1/8" Allen key is required) if the user doesn't shoot suppressed. The vent is located below the shell deflector.


    In this picture, you can see there's line of sight to the carrier's gas ports.





    URF v2's and URF-S v2's over pressure gas relief vent is licensed from BATTLEARMS IP under U.S. Patent No. 8,910,406
    We had tested it extensively, and thought it would be different enough to file our own patent, but as it turned out, the patent was broad enough to cover our shell deflector based over pressure relief vent. So we opted to license it from Battle Arms so as not to infringe on its patent.

  2. #2
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    Interesting design. Looking forward to hearing feedback from people using suppressors. Hopefully there are still available when I get back to the States!

  3. #3
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    We had tested it for more than a year, with various positions and angles. The port under the shell deflector is in the path of the carrier and its gas ports as it travels rearward, the path is much shorter and direct than any other venues for the gas to escape.

    Gas would normally get pumped out of the forward assist and charging handle gap. The over pressure relief doesn't seek to eliminate that, but to provide the first chance and much more direct path, so to reduce both the volume and velocity of gas existing from all available exits.

  4. #4
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    So would this work well with a Lantac carrier which vents forward? Or better with a standard bcg?
    -One Nation, Under God

    -"The bad news is time flies. The good news is you're the pilot." ~ Michael Althsuler

  5. #5
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    Quote Originally Posted by Aragorn View Post
    So would this work well with a Lantac carrier which vents forward? Or better with a standard bcg?
    Appears to mitigate gas after it has been ported regardless of carrier.

    Smart design.

  6. #6
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    Regardless how many gas ports and their venting direction on the carrier, gas is still existing the carrier through them, well after the carrier and its vents recesses into the upper, past the ejection port.

    The over pressure relief port is in direct line of sight of the carrier's gas vents, and is the shortest and most direct route for gas to exit the upper.

  7. #7
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    Quote Originally Posted by Duffy View Post
    We had tested it for more than a year, with various positions and angles. The port under the shell deflector is in the path of the carrier and its gas ports as it travels rearward, the path is much shorter and direct than any other venues for the gas to escape.

    Gas would normally get pumped out of the forward assist and charging handle gap. The over pressure relief doesn't seek to eliminate that, but to provide the first chance and much more direct path, so to reduce both the volume and velocity of gas existing from all available exits.
    Anybody test it for us freak of nature southpaws ?

  8. #8
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    We did, for more than a year, with an imperfectly drilled over pressure relief port, and it worked even then lol.

    The production relief port is drilled perfectly and in the path of the gas ports on the carrier, to the point there's line of sight, couldn't be more direct.

  9. #9
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    Quote Originally Posted by Duffy View Post
    We did, for more than a year, with an imperfectly drilled over pressure relief port, and it worked even then lol.

    The production relief port is drilled perfectly and in the path of the gas ports on the carrier, to the point there's line of sight, couldn't be more direct.
    There goes more of your product into my next build

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