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www.ModulusArms.com

October 20, 2014

www.ModulusArms.com | AR-308 Jig Instructions

Introduction

If your lower can accommodate an AR-308 upper, it is compatible with the Modulus Arms 80% AR-308

Lower Receiver Jig. The Modulus Arms jig utilizes the same standardized lower features designed to

center an AR-308 upper to properly locate the features that need to be fabricated, resulting in a

universal fit. A billet 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-held power tools, and

reduced risk of failure.

For the experienced builder, the Modulus Arms jig offers universal compatibility, increased precision,

and reduced fabrication time. Modulus Arms also offers individual replacement parts which are

available for purchase at www.modulusarms.com.

The lower is easily completed with four straightforward 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:

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Bosch PR20EVSK Manuale Utente Pagina 2