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Yes... Those are standard o-rings where you put the gas adapter to fill the magazine to serve the purpose for why it's made... You aren't supposed to need to buy them separately.
May I ask where you bought them? How are you trying to install the o-rings so that they "fit"?
The only o-rings that are aftermarket are sequential's silent fill o-rings and they're meant to prevent leakage like you described. I think the ones I have are similar to his but not sure if they're 70D.
Last edited by RainyEyes; September 29th, 2017 at 22:54..
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