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Thread: Improved QB Breech

  1. #1
    Senior Member SeanMP's Avatar
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    Improved QB Breech

    The basic QB breech is something that I have always wanted to tackle as an improvement upgrade project. Some recent posts and conversations finally gave me the push to get on with it.
    I had a number of things I wanted to accomplish.
    • Complete compatibility with all existing QB parts
    • Much more positive registration on the tube
    • A longer barrel socket with three points of contact to get rid of the notorious wiggle
    • A real dovetail with a flat top
    • The same OD as the tube to give the rifle a better visual balance
    This is what I came up with

    IMG_0416.jpgIMG_0417.jpg

    The OD of the breech is 7/8" giving it the same OD as the tube.
    The length is 3/4" longer giving a total of 2" of barrel socket. The QBD and AR barrels simply slide into a bored recess and the thinner QB barrel has a sleeve which slides onto the barrel and into the socket.
    The registration of the breech to the tube is almost 3 times wider giving a very stable mounting.
    IMG_0418.jpg

    Of course the transfer port is milled for a positive sealing face.

    IMG_0419.jpg

    There are two additional setscrews placed discreetly at 120 and 240 deg to provide the three points of contact for barrel stability

    IMG_0420.jpgIMG_0421.jpg

    A true 11mm dovetail runs the full length of the breech and is .075" higher to provide clearance for the objective of an AO scope. On all of my QB's the AO ring bumps the barrel on medium rings. And the loading port is just a fraction bigger and beveled both ends to provide just a bit more finger room.

    IMG_0422.jpg

    Overall I think I hit all the major improvements that could be made on a QB breech

    Any thoughts?
    Last edited by SeanMP; Feb 12 2013 at 03:12 PM.
    Sean

  2. #2
    Senior Member remtom1200's Avatar
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    That looks perfect! Nice seeing a larger saddle and longer length.
    For every mile of road, there's two miles of ditch

  3. #3
    Senior Member sholo's Avatar
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    LOL...Ya could of at least made it a multi-shot....

    Just kiddin' ya, man..... AWESOME job! (WTH is the "drool" icon?) I'd say you covered all the bases VERY well!

    Takin' orders yet?....


    Todd


    P.S - I see we like the same scope (even on the same power level, too!)
    Todd

    Don't sweat the petty things, and don't pet the sweatty things!

  4. #4
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    Beautiful work! Will you be offering this in a left-handed version, too?

  5. #5
    Senior Member SeanMP's Avatar
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    Quote Originally Posted by sholo View Post
    LOL...Ya could of at least made it a multi-shot....
    Haha...Nope...I'm not that smart

    Takin' orders yet?....
    Not yet, I need to make a few...If I priced off a proto everything would be a $1000

    P.S - I see we like the same scope (even on the same power level, too!)
    Great minds Todd....great minds!
    Sean

  6. #6
    Senior Member SeanMP's Avatar
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    Quote Originally Posted by Scottster View Post
    Beautiful work! Will you be offering this in a left-handed version, too?
    Geez I had not thought of that but left hand is just as easy.
    Sean

  7. #7
    Moderator rsterne's Avatar
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    Beautiful job.... Too bad making this stuff takes so long, huh?....

    Bob
    Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
    Airsonal: Too many to count!

  8. #8
    Senior Member SeanMP's Avatar
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    Quote Originally Posted by rsterne View Post
    Beautiful job.... Too bad making this stuff takes so long, huh?....

    Bob
    It would be nice if I could dream it and then elves cranked it out while I slept.....worked for shoemakers
    Sean

  9. #9
    Member Gippeto's Avatar
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    Very nice Sean.

    Did you start with heavy wall tubing or do you like drilling/reaming deep holes?

    Thoughts....hmmmm.....why not drill, tap and mount a weaver base?

    Al

  10. #10
    Senior Member SeanMP's Avatar
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    Al

    I drilled and reamed solid 1144 stock. I find this much easier than dealing with snarly DOM stock. It was actually fairly painless.

    As far as the weaver base goes I needed complete compatibility with existing QB stuff. That includes the nifty FWB 300 clone rear sight which fits on 11mm dovetail. And the option is always there to use one of the adapters that slide onto the dovetail.

    Besides I'm an Anschutz guy...weaver bases are the stuff of HEATHENS
    Sean

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