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Personally, i like em. I dont think they are really necessary tho.

When i got my RUC i didnt even know it had one. When I swapped my trigger out I noticed it. I slight amount a play and i tightened it right out.

Theres a few others that have this feature, and i believe MEGA makes these lowers iiirc.

Btw just tighten it till theres no play. If you overtighten it, you'll know. You wont be able t mate the upper n lower together.
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