Yep, mistakes can be pricey but, we learn from mistakes. (Ours or others). I use a block designed to hold the upper with and insert to prevent it from collapsing in the vice. It still has some play that I don’t care for so, I just take my time with the barrel nut alignment (aiming for the lowest torque possible). When inserting the trigger guard pin I put the guard in place to prevent flex on the ears as well as support the lower ear on a block (when later down). Then, lightly tap in the pin till it’s flush. Patience is key.
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