LOL. I did exactly that till my replacement spring came. Of course I had to buy a bunch of other stuff to go with it because paying $4 shipping for a $.68 spring seemed sort of silly.
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I hope this isn't a stupid question, but does the buffer retainer and spring actually do anything after the upper and lower are assembled? I mean, if it's only function is to retain the buffer and buffer spring until assembly, can a failure of the retainer affect operation of the rifle?