Standard/MK1/MK2/MK3 - are bolts interchangeable??

Discussion in 'Ruger Rimfire Forums' started by ccsjl, Jan 28, 2014.

  1. ccsjl

    ccsjl New Member

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    I acquired an MK2 upper..I know I can use a Standard/MK1 and an MK2 bolt in it. What about a MK3 bolt?
     
  2. ccsjl

    ccsjl New Member

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    Customer service said all bolts are the same EXCEPT a MK2 or MK3 bolt does not have the cutout for the safety engaged hold open that Standard/MK1 bolts do. Other than that it works...