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Daystate Huntsman Regal Transfer Port.

Discussion in 'Technical' started by garyjm, Oct 8, 2019.

  1. garyjm

    garyjm Posting Addict

    Likes Received:
    Washington and Bulgaria
    Currently confined to bed after a accident and will spend most of this winter on crutches.

    Motivation time. ;)

    I have a old project on a FAC Regal I want to complete this winter, shot count is crap, 10-12 per fill.
    I have amassed quite a few spares, springs, hammer, Huma reg etc. I think I can cobble a workable solution together but am unsure about the Transfer Port, size, screw regulated etc.
    Anyone have any info?
    I cannot strip the Regal at the moment due to being stuck in bed. Just trying to get some info.

    Thanks Gary
  2. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

    Likes Received:
    Sorry to hear of your situation!

    IMO when setting up any regged gun:
    - Go as large as you can on the port.
    - Set the reg pressure high and test off-reg / below this pressure to find the velocity peak pressure.
    - Set muzzle energy on striker at peak pressure as necessary and re-test to find new peak pressure (will be lower if striker energy is reduced, higher if it's increased).
    - Set reg to velocity peak pressure.
    - Chuck it all back together - job done!

    Tbh I very much doubt you'll get more efficiency out of the gun and can only hope for so much from the pitifully small cylinder, however for a given output enlarging the port will give you a lower ideal operating / reg setpoint pressure.

    Be aware that the effective transfer port diameter is determined by the smallest point in the system; so the size of the port in the barrel, bush and exhaust valve housing need to be matched (and there's no point in going larger on one than the rest are).

    Also be aware that Daystate have a habit of drilling their ports very close to the valve seat area; so if over-boring the valve body check that it's not going to break through into the valve seat.

    Have fun ;)
    Jemsbro and garyjm like this.
  3. garyjm

    garyjm Posting Addict

    Likes Received:
    Washington and Bulgaria
    Thanks Cloverleaf, your post is valuable. The rifle is a 40ft/lbs version. I guess all the porting is at its maximum. I was thinking I might have to reduce.
    The Regal was a 60 birthday present from my wife, I cannot sell it even though she made the wrong FAC choice. I will muddle along over the winter and hopefully find a compromise.
    cloverleaf likes this.
  4. Jemsbro

    Jemsbro Engaging Member

    Likes Received:
    Daystate themselves only quote 15 shots for the factory regged 40ftlb version and you might well get similar results with a strip & polish without adding a regulator so I think you'll have to reduce the power to increase the shot count.
    Robert Lane has some vids on YouTube which cover setting up regulators which are very good.
    I have both 30 & 40ftlb non regged Regals so am very interested to see how you get on. Best wishes for a speedy recovery too.

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