It eliminates play between the AR-15/AR-10 upper and lower receiver, which helps accuracy.
Yes. It buffers the cycling system to reduce wear on impacting surfaces.
No. It is easy to install with no weapon modifications.
No. It is not a firearm, so it ships directly to your address.
Related: Shooting accessories · AR-15 upper assemblies
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Tags: accu-wedge, ar-15 receiver fit, upper lower play, ar-10