The 7/8 roll pins get stuck often when assembling early M16 lowers. These are just small enough to prevent mushrooming. My E1’s will come with these FYI
Short Roll Pins XM16E1 - 601 - 602
$4.00
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602 Lower Receiver
$625.00
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100% Rollmarked 608
$700.00
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100% Rollmarked GAU-5/A
$575.00
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100% Rollmarked GAU-5/A/A
$550.00