Bosch PR20EVSK User Manual download pdf (Page 16)

www.ModulusArms.com

October 20, 2014

www.ModulusArms.com | AR-308 Jig Instructions

Figure 3.3: Lower with Fire-Control pocket holes drilled

Configure jig for milling: The configured jig is shown in figure 3.4 after the drill guide is removed.

Figure 3.4: Jig configured to mill the fire-control pocket

Fire-Control Pocket Milling: A router and end mill is used to form the cavity (figure 3.5) and the

completed lower with the fire-control pocket is shown in figure 3.7.

1. Figure 3.5 (middle) shows the end mill depth adjusted to touch to top of the lower as indicated

by the 1

hash mark. The distance to the next has mark is the maximum depth per pass. Figure

3.5, left shows the end mill adjusted for the final pass that will from the pocket to a depth of

1.249”

2. Insert router through the jig into a previously formed drill hole or trigger slot without the end

mill touching the side wall of the lower. Carefully turn on the router, and allow the router to

come up to full speed.

3. With firm downward pressure applied to the base, mill using shallow clockwise passes with light

pressure. First adjoin the all holes and trigger slot by removing the rib between them, then

widen until the end mill touches the side of the template. Turn off the router, wait until the end

mill stops spinning, and remove from the jig. Figure 3.6 shows the lower after the

first pass.

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Bosch PR20EVSK User Manual Page 16