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Okay, for those f you that have leaky Crosman MAR177 PCP uppers here are a couple of links that may help. The first link is an excellent exploded view & parts list of the MAR177. The second link is to an O-ring set from Amazon. The O-rings that you need are #1700B005 (4x) and #130-035 (1x). There are enough O-rings in each set to reseal 2 uppers.
Not to be a buss kill, you must literally disassemble the entire upper to replace the O-rings . It's somewhat tedious and frustrating, but to quote my son, "if it's hard you are doing something wrong". Contact me and I can walk you the though the process. Ed
https://support.crosman.com/hc/en-us/article_attachments/202477694/MAR177_EVP_PART_LIST.pdf
https://www.amazon.com/gp/product/B01AHIELTA/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Comments
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Just ordered the o ring kit. I need to do this to mine. I took it apart once, but it leaks worse now than before.
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