Lancer Tactical
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Lancer Tactical's M4 Buffer Tube Ring is a metal replacement for Lancer Tactical M4 series AEGs that locks the buffer tube to the receiver. It's the part, sometimes called the castle nut, that keeps the stock from developing wobble when the assembly gets worked loose. Fit it with proper torque and check it after a few games, since a buffer tube that's been on and off a few times tends to loosen once and then stay put.