Near perfect product - Real Avid Lug-Lok Upper Vise Block

I used this upper receiver vise mount and it functioned as it should. No complaints! Great construction. Quality materials. Easy to use. Its all aluminum construction seems to be sturdy enough for any torque that you'd apply to an upper. Only gave it 4 stars due to slight slop where it holds by the chamber but it caused no issue and seems to me that it's not enough to cause any in the foreseeable future.