We build a lot of uppers and use both the wrench from the wheeler and the Magpul armor wrench. Another good option is the one made by JE Machine, which they make or use to make them for PSA.
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I really like my vise blocks, to hold the upper and lower.
And also my roll pin punches that have little tips to keep them centered in the roll pins. There are a bunch others I'd really like to get too😁.
We build a lot of uppers and use both the wrench from the wheeler and the Magpul armor wrench. Another good option is the one made by JE Machine, which they make or use to make them for PSA.