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Thread: Superstar\ RB2 .25 rotary breach

  1. #16
    Join Date
    Apr 2008
    Location
    Middleton St. George
    Posts
    472
    I have a .22 RB2 and it has no grub screw. I am having problems with the piston though and wondered if there were any different pistons fitted? Mine seems to rest too far forward to fit the cocking link pin to the cocking slide with a spring fitted, but won't pull back far enough to engage with the sear if I remove the spring.

  2. #17
    edbear2 Guest
    Quote Originally Posted by gary_c_ham View Post
    Its just the .25 ones that have the grub screw to keep the power down with the larger calibre.
    The one I did was a .177.

    ATB, ED

  3. #18
    edbear2 Guest
    See post 112 regarding Sandwell, may be of interest;

    http://www.airgunbbs.com/showthread....RB2-tune/page8

    ATB, Ed

  4. #19
    Join Date
    Feb 2018
    Location
    Hertford
    Posts
    31
    for anyone interested it is indeed a 1/16" allen key that fits, but I'm having to apply heat as the grub screw is either tight or threadlocked tight in.

    Quote Originally Posted by edbear2 View Post
    Sounds like 1/16'' Imperial then, that's about between the two, Invest in a good set of imperials I would say, ATB, Ed

  5. #20
    Join Date
    Mar 2009
    Location
    durham
    Posts
    3,454

    Superstar\ RB2 .25 rotary breach

    Quote Originally Posted by gary_c_ham View Post
    Its just the .25 ones that have the grub screw to keep the power down with the larger calibre.
    Nope my .22 had one too.

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