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Thread: Barrel breach end dimensions for 1377

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  1. 18-03-2019, 05:56 PM #1
    Andrewjames
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    Barrel breach end dimensions for 1377

    Having difficulty with the breech end on my 2240 converted from a 1377 barrel + GMAC flow through bolt probe, I need to make the breach end right but cannot figure out the correct cutting angles..

    Does any machinists out there know the figures by any chance? Might be a long shot I know. No pun intended..

    A
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  2. 18-03-2019, 07:14 PM #2
    averageplinker
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    Quote Originally Posted by Andrewjames View Post
    Having difficulty with the breech end on my 2240 converted from a 1377 barrel + GMAC flow through bolt probe, I need to make the breach end right but cannot figure out the correct cutting angles..

    Does any machinists out there know the figures by any chance? Might be a long shot I know. No pun intended..

    A
    What is the issue? In the past I have run a 2240 with a 1377 barrel without any issues. One with a crooked barn breech and another with a standard plastic breech.

    I know this may seem insulting to ask but is the probe a.22" probe and is causing the issue not the breech?
    Rich.
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  3. 18-03-2019, 07:28 PM #3
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    T 20
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    Quote Originally Posted by averageplinker View Post
    What is the issue? In the past I have run a 2240 with a 1377 barrel without any issues. One with a crooked barn breech and another with a standard plastic breech.

    I know this may seem insulting to ask but is the probe a.22" probe and is causing the issue not the breech?
    Rich.
    I'm wondering if it could be due to their being 2 different 1377 barrels, Rich, the throats are different on early and late model guns ?


    All the best Mick
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  4. 18-03-2019, 08:13 PM #4
    Andrewjames
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    no the barrel was fine but it was bugging me that the barrel didnt sit against the breech as the pellet was seated, so i squared it off and then realised the breech was drilled and has a recess.. then to make matters worst the probe is now pushing the barrel more forward that the transfer port needs to be to be aligned with the tube.. its all a bit of a mess!

    probe is for a 177 so all good!
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  5. 18-03-2019, 08:49 PM #5
    averageplinker
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    Unfortunately I sold mine a while back otherwise I would measure it for you.
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  6. 18-03-2019, 08:54 PM #6
    --ped--
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    I only have a drawing for the phase 1 and 2 barrels I'm afraid
    I did make a chambering ream for .22 but for .177 I use the rack of eye and twist of gob approach
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