A much needed tool for any ar build - JE Machine Tech AR-15 Vise Block Upper & Lower Combo

At first I was apprehensive about spending so little on these tools. Still, they are necessary if you're ever going to get serious about building your AR platform rifle or pistol. That said, I was surprised at how snug the fit was for both the upper and lower receiver blocks on my Aero Precision upper and lower.

Could I have spent more? Sure, but I'm glad I didn't. These work great, better than expected.