1. Attention: We have put together a thread with tips and a tutorial video to help with using the new software. Please take a moment to check out the thread here: Trapshooters.com Tutorial & Help Video.
    Dismiss Notice

Go, No Go, Gap Between Barrel and Receiver Face on MX2000 Perazzi

Discussion in 'Gunsmithing' started by Wildcat Lewis, Dec 25, 2016.

  1. Wildcat Lewis

    Wildcat Lewis Member

    Joined:
    Jul 29, 2010
    Messages:
    166
    Location:
    Central Florida
    When swapping barrels around on an MX2000 Perazzi what's the max space safely allowable between the receiver face and barrel breach surfaces?

    WL
     
  2. skeet_man

    skeet_man Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    10,810
    Location:
    Rochester, NY
    Basically, zero.

    Close the gun, and hold the top lever open. With the gun as closed as it can be, if you can see daylight b/w the two it's too much.
     
  3. JACK

    JACK Well-Known Member Supporting Vendor

    Joined:
    Apr 28, 2006
    Messages:
    15,024
    Location:
    NW Wisconsin
    agreed
     
  4. Don Rackley

    Don Rackley Well-Known Member Supporting Vendor

    Joined:
    Jan 14, 2007
    Messages:
    1,383
    I measure the barrel to receiver face with a feeler gauge. In my opinion, anything over 0.006" needs attention.

    Don
     
    Chris Covell, Wildcat Lewis and smokintom thanked this.
  5. PMC1958

    PMC1958 TS Member

    Joined:
    Dec 14, 2016
    Messages:
    27
    I thought the term was "on face" meaning the breach end of barrels where in full contact with the breach face of the action on break action guns. I think that there is a slight space between the barrels and the water table when the barrels are on face.
     
  6. semperfi909

    semperfi909 Well-Known Member

    Joined:
    Nov 27, 2009
    Messages:
    2,066
    Water table is a stupid term applied to guns - action flats are what is meant. O/U's have different kinds of flats and on Perazzis the top of the sides of the action are what you get. Those flats and the bolsters on the sides of the barrels (Perazzi barrel flats) comprise a major component of on/off face fitting and they WILL be in contact. If the barrel face and the action face are absolutely parallel then the pivots and recesses set the face and that is not a common problem with changing barrels in Perazzis. In SxS the locking bar pulls the barrel flats and action flats into contact for face parallelism and the pivot pin and the notch in the barrel lug sets the face.

    And I've heard all the BS about "water table" before so please don't bother. Misconception promulgated through time does not equal truth. Ignorance begetting ignorance does not ultimately produce enlightenment.
     
    Last edited: Dec 26, 2016
    BENCHREST, trappermike and Neil Winston thanked this.
  7. JACK

    JACK Well-Known Member Supporting Vendor

    Joined:
    Apr 28, 2006
    Messages:
    15,024
    Location:
    NW Wisconsin
    Water tables and action flats? Geez. Let Doug Braker work it out
     
    bossbasl thanked this.
  8. Wildcat Lewis

    Wildcat Lewis Member

    Joined:
    Jul 29, 2010
    Messages:
    166
    Location:
    Central Florida
    Thanks to all for the help and advice. Fixing to try a top shingle on my 2000 RS. The max Clarence between the barrel and receiver surfaces to shoot safely was what I was needing.

    Thanks again
    WL
     
  9. Brent Paulus

    Brent Paulus Well-Known Member

    Joined:
    Jan 22, 2015
    Messages:
    1,294
    Location:
    Springfield,Ohio
    Why not contact Perazzi and see what they have to say?
     
  10. Steve W

    Steve W Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    5,407
    Location:
    Los Angeles
    Do you see light between the breech and the barrel like this?

    breech gap -2 jpg.jpg
     
  11. HSLDS

    HSLDS Well-Known Member

    Joined:
    Nov 2, 2006
    Messages:
    6,863
    Location:
    S-E PA
    'Poor man's solution.'

    Take a new dollar bill, place it between the barrel breach and the action face, about half way down the face - and close the action. rest the hinge on your leg, so gravity is trying to open the action. Now pull on the bill (left to right, not up and down). If you can move it the action is too loose.

    If the action has some kind of 'tit' protruding (doll's head, locking lug, etc.) you need to get a bit creative, but the process is the same.
     
    ramorton, Wildcat Lewis and jlmccuan thanked this.
  12. ramorton

    ramorton TS Supporters TS Supporters

    Joined:
    Jan 8, 2006
    Messages:
    1,823
    Location:
    San Angelo, Tx
    Mr. Rackley gave you the answer. Engineer's are quite accurate regarding tolerances.
     
    Wildcat Lewis thanked this.
  13. Roger C

    Roger C Banned User Banned

    Joined:
    Jan 29, 1998
    Messages:
    504
    Location:
    Litchfield Park, Arizona
    Don, At .006 it needs a lot of attention. Roger C.
     
    theunloader thanked this.
  14. Jaxshooter

    Jaxshooter Active Member

    Joined:
    Aug 30, 2007
    Messages:
    416
    I have always used .005 to .006. I got the information from a Perazzi smith.
     
  15. 2llc

    2llc Well-Known Member

    Joined:
    Jun 8, 2011
    Messages:
    1,243
    Location:
    Eastern Oregon
    I believe there is another measurement or fit that should enter into this. When placing a shell in the chamber is the base flush or is it perhaps recessed into the chamber? If recessed then that should be measured and added to the gap clearance...... I believe that would equal total headspace?? I have no idea what should be proper in a shotgun but .006" in most rifles is excessive..... This is more of a question than a statement so please be gentle. LOLOL Larry
     
    keoni thanked this.
  16. RichTozer

    RichTozer Member

    Joined:
    Nov 29, 2016
    Messages:
    52
    Location:
    SE Michigan
    Would think that anything les ls than 0.00" tolerance would cause undue wear/stress in the long term.
     
    2llc thanked this.
  17. JEB

    JEB Active Member

    Joined:
    Jan 29, 1998
    Messages:
    234
    A piece of plain paper is approximately .003" thick. Tear off a strip and slip it in between the barrel and the receiver. If it pulls out freely then you know that the gap is more than .003. If there is a distinct drag or if it is tight, you should be ok. However nothing beats a qualified gunsmith taking a look.

    JEB
     
    2llc thanked this.
  18. 2llc

    2llc Well-Known Member

    Joined:
    Jun 8, 2011
    Messages:
    1,243
    Location:
    Eastern Oregon
    Any gap in a hinged receiver/barrel assembly equates to an angle between the two, not two parallel surfaces. The more the gap the more the angle. Rifle, pistol or shotgun makes no difference as the bore, chamber and shell should be at 90° to the receiver for strength and accuracy. Larry
     
    Roger C thanked this.
  19. semperfi909

    semperfi909 Well-Known Member

    Joined:
    Nov 27, 2009
    Messages:
    2,066
    Yes and No. That would be the likely case with interchanging Perazzi barrels in my experience. However, worn pivot pins/barrel lumps can get the gun off face and still have the faces parallel - and this is not uncommon at all.
     
    2llc thanked this.
  20. 2llc

    2llc Well-Known Member

    Joined:
    Jun 8, 2011
    Messages:
    1,243
    Location:
    Eastern Oregon
    Semperfi, in the case of worn pieces would it be necessary for the base of the shell to protrude past the chamber bore to "take up the slack?" or does the locking of the lever pull things into line? Larry