AR Sponsor
Posted: 12/17/2012 8:53:01 PM EDT
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I have an SP01 on whose lower I want to shoot a .300 AAC Blackout upper. The .300 upper uses a 6.35mm front pivot pin where the original pin is 8.05mm. Where can I find a pin to let me use this upper?? I don't want to make any alterations to the lower as I also want to be able to use the original .223 upper too! I'm sure there is some type of pin or shims/busgings that will let me do this.
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AR Sponsor