ID Help requested

[HKGuns]

Got this in the box with my Wilson Combat stripped lower.

Never seen anything like it before.

Does anyone know what this is? It was in a tiny ziplock bag.

[ksubuck]

If your upper and lower have some play between them, you can slide that in the hole at the back of the fire control pocket under the takedown pin. It will tighten the fit up.

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[HKGuns]

So it’s a Wilson wedge!

Thanks I don’t use wedges.

[bamashooter]

https://www.ar15.com/forums/ar-15/Wh...r-/118-721152/