If you’ve built or own a few AR-15s you probably have at least one with a little bit of wobble or play between the upper and lower receivers. This isn’t an issue and won’t have any adverse effects on the rifle. It’s more of an annoyance really. Well F&D Defense has a new lower that they claim eliminates this wobble.
Their patent pending SHUT feature (Solid Hinge Upper Tensioning) creates tension between the upper and lower receivers and removes the wobble, it’s pretty much a bump built into the lower that does this. Check out how it works in the video above. They retail for $119.99 at fddefense.com.
