Bosch PR20EVSK User Manual download pdf (Page 2)

www.ModulusArms.com

October 6, 2014

www.ModulusArms.com | AR-15 Jig Instructions

Introduction

If your lower can accommodate an AR-15 upper, it is compatible with the Modulus Arms 80% AR-15

lower jig. The Modulus Arms jig utilizes standardized features within the lower receiver designed to

accommodate an AR-15 upper to properly locate the templates, resulting in a universal fit. A forged

lower completed with the Modulus Arms 80% jig using basic hand-held power tools is shown below.

For the

first time user, the Modulus Arms jig offers increased safety (no milling with a drill press), a simple

and easy to use process, compatibility with commonly available hand power tools, and reduced risk of

failure.

For the experienced builder, the Modulus Arms jig offers universal fit, increased precision, and reduced

fabrication time. Modulus Arms also offers individual replacement parts.

The lower is easily completed with four simple steps to fabricate the : 1) the trigger slot, 2) the rear shelf

pocket, 3) the fire control pocket, and 4) the fire control pin holes (trigger pin, hammer pin, and safety

selector). To reduce the fabrication time and to improve the finish, a router with an end-mill is used to

finish the cavity that is first hollowed out with a drill bit in the

first three steps.

Once any of the required finishing features are started, the lower is considered a firearm and all local,

state, and federal firearms laws will apply. It is your responsibility to check the legality of finishing and

owning an 80% lower in your area. Please make sure you are familiar with the safe operation of power

tools before using the Modulus Arms jig to complete your lower.

Modulus Arms Jig Part Description & Key Features

The Modulus Arms 80% Jig kit contains the following parts as shown in figure 1 and listed below:

1. Template

2. Side Plate (2x)

3. Drill Guide

4. Front Support

5. Rear Support

6. Buffer Support

7. Depth Gauge

8. Cap Screws [8-32 x ½”] (12x), [8-32 x ¾”] (2x)

9. Side Plate Support Cap Screw [8-32 x 1.5”] (2x)

10. Rear Take Down Cap Screw/Nut [1/4-20 x 2.25”]

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Bosch PR20EVSK User Manual Page 2