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The SmithBlock 15U is the first of its kind: a 3D printed and steel-reinforced armorer's upper block that utilizes the AR-15 upper's ejection port to steady and secure an upper in a vice. Extruded from PETG filament--know for its strength and flexibility--the SmithBlock 15U won't mar the upper's finish and has been tested to withstand 65 foot-pounds of pressure while tightening or loosening a barrel nut.

To use the SmithBlock 15U, start by removing the Stabilizer (the attached bar) by unscrewing the two Stabilizing Screws. Once detached, insert the block to the mil-spec upper; align the Stabilizer with the small circular indent which needs to be on the outside and to the left of the ejection port; and proceed to turn the Stabilizing Screws until snug.