How To Assemble an AR-15

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Assembling an AR-15

























Table of Contents

v

Table of Contents List of Figures .................................................................................................................................................... vii Overview .............................................................................................................................................................. ix Tools You Will Need ........................................................................................................................................... ix Assembling the Lower ....................... ................................. ...................... ....................... ....................... ........................ .................... .................... ........................ ....................... .................... ............. ....11 Installing the Pivot Pin .................................................................................................................................... 3 Installing the Magazine Catch................................ ............................................ ........................ ....................... .................... .................... ....................... ........................ ...................... ..........3 Installing the Bolt Catch ....................... .................................. ...................... ....................... ........................ .................... .................... ........................ ....................... ....................... .................. ......4 Installing the Trigger ....................................................................................................................................... 4 Installing the Hammer .................................................................................................................................... 5 Installing the Trigger Guard............................... ........................................... ........................ ........................ .................... .................... ....................... ....................... ........................ .............. .. 5 Installing the Safety Selector.............................. .......................................... ........................ ........................ .................... .................... ....................... ....................... ........................ .............. ..6 Installing the Grip ............................................................................................................................................ 6 Installing the Takedown Pin ....................... .................................. ....................... ........................ ....................... .................... .................... ....................... ........................ ...................... ..........7 Installing the Stock and Buffer Tube ............................... .......................................... ....................... ....................... ...................... ....................... ........................ ...................... .......... 7 Installing the Buffer ....................... ................................. ...................... ....................... ....................... ........................ ........................ ........................ ........................ ....................... .................... ...........8 Assembling the Upper ....................... ................................. ...................... ....................... ....................... ........................ .................... .................... ........................ ....................... .................... .............. ..... 3 Attaching the Barrel ........................................................................................................................................ 11 Inserting the Bolt Carrier Group and Charging Handle ..................... ................................. ....................... .................... ..................... ....................... ............. .. 12 Installing the Free Float Handguard ....................... .................................. ....................... ........................ .................... .................... ........................ ....................... .................. ....... 12 Pinning and Securing the Gas Block .................... ................................ ....................... ....................... ........................ ........................ ........................ ....................... .................. ....... 13 Installing the Flash Hider......................... Hider................................... ...................... ........................ ........................ .................... .................... ....................... ....................... ........................ ............ 13 Completing Assembly and Operation Check .............. .......................... ........................ ........................ ....................... .................... .................... ....................... ................... ....... 15













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Assembling















List of Figures

vii

List of Figures Figure 1: The Pivot Pin in Extended Position _________________ _________________________ ________________ ________________ ________________ ________________ ________ 3 Figure 2: The Left Side of the Lower Receiver, Showing the Magazine Catch _________ _________________ ________________ _______________ _______ 3 Figure 3: The Left Side of the Lower Receiver, Showing the Bolt Catch Above the Magazine Catch ______________ 4 Figure 4: Trigger with the Trigger Spring in Place _______________ _______________________ _________________ _________________ ________________ _____________ _____ 4 Figure 5: the Trigger Pin Being Pushed Through The Trigger, Disconnector and Receiver _________ _________________ _____________ _____ 4 Figure 6: Trigger and Disconnector Set Into the Lower Receiver _______________ _______________________ ________________ _________________ ___________ __ 4 Figure 7: The Hamme Hammerr with Hammer Spring in Place ________________ _________________________ _________________ ________________ ________________ _________ _5 Figure 8:The Hammer Pinned in Position _____________________ _____________________________ ________________ ________________ ________________ _______________ _______ 5 Figure 9: The Trigge r Guard _____________________ ____________________________________________ _______________________________________________ __________________________ __ 5 Figure 10: Bottom of the Lower Receiver, Showing the Hole Where the Safety Selector Detent is Placed _________ 6 Figure 11: Safety Selector ________________________________________________________________________ 6 Figure 12: The Grip Screw ________________________________________________________________________ 6 Figure 13: The Grip Going Onto the Receiver with the Safety Se lector Detent Spring Entering the Grip ___________ ___________ 6 Figure 14: The Takedown Pin (Ne ar) and the Pivot Pin (Far) in Their Extended Positions _________________ ______________________ _____ 7 Figure 15: Stock Receiver Plate ____________________________________________________________________ 7 Figure 16: Bu ffer Tube Holding the Buffer Stop in Position ___________________ ___________________________ ________________ _________________ ___________ __ 7 Figure 17: Buffer Held in Position by the Buffe r Stop _____________ _____________________ ________________ _________________ _________________ _____________ _____ 8 Figure 18: I nserting the Buffe r Spring and Buffer Into the Buffer Tube ________________ ________________________ ________________ _____________ _____ 8 Figure 19: The Barrel Set Into the Upper Receiver __________________ __________________________ ________________ ________________ ________________ __________ __ 11 Figure 20: The Barrel Nut Threaded Onto the Upper Receiver ________________ ________________________ ________________ ________________ __________ __ 11 Figure 21: Gas Tube Inserted Through Barrel N ut and I nto the Upper Receiver _______________ ________________________ ______________ _____ 11 Figure 22: The Charging Handle __________________________________________________________________ 12 Figure 23: Bolt Carrier Group ____________________________________________________________________ 12 Figure 24: Free Float Handguard Handgu ard _________________________________ __________ ______________________________________________ ________________________________ _________ 12 Figure 25: Handguard Lock Nut Tightened Against the Free Float Handguard ________________ _________________________ _____________ ____ 12 Figure 26: Gas Block with Gas Tube I nserted _________________ _________________________ ________________ ________________ ________________ _______________ _______ 13 Figure 27: Gas Block Secured Onto the Barrel ________________ ________________________ ________________ ________________ ________________ _______________ _______ 13 Figure 28: Flash Hider Fastened to the Barrel ________________ ________________________ ________________ ________________ ________________ _______________ _______ 13 Figure 29: Comple ted Rifle W ith Its A ccessories ________________ ________________________ _________________ _________________ ________________ ____________ ____ 18

























Overview

ix

Overview The instructions in this manual will guide you step-by-step through the process of assembling a common AR-15 rifle. It assumes the rifle will use a free-float tube handguard, as opposed to a traditional A2 handguard, and an adjustable carbine stock, as opposed to a solid A2 stock. These decisions were made to reflect the increasing prevalence of these two component types in custom civilian rifles. In all other respects, the instructions in this manual are universal to the AR-15 platform and will be the same across all rifles.

Tools You Will Need You will need several tools to assemble your AR-15. These tools include the following: • • • • • •

1 x Armorer’s Wrench with fittings for a carbine/M4 stock and flash hider 1 x Free-float tube wrench with fittings for a free-float barrel nut and a nd locking nut 1 x Set of AR-15 pin punches 1 x Small, light hammer 1 x Small pliers 1 x Allen wrench set

With the above tools you will be able to completely assemble your rifle. However, However, there are several items which you can invest in which will make working on your AR-15 much faster and easier. They include: • •

1 x Vise and AR-15 action block 1 x A2 front sight bench block

























Assembling the Lower




























This section provides instructions instructions on how to assemble the lower portion of the AR-15. This is commonly referred to simply as the lower . The lower contains the majority of the moving parts and is the most complex assemblies. It contains the lower receiver, which is for the purpose of firearms transfers considered the weapon. All other pieces of the weapon may be bought and sold without restrictions. To complete this assembly, you must complete complete the following steps: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Installing the pivot pin Installing the magazine catch Installing the bolt catch Installing the trigger Installing the hammer Installing the trigger guard Installing the safety selector Installing the grip Installing the takedown pin Installing the stock and buffer tube

Installing the Pivot Pin

1.

Insert the pivot pin detent spring into the hole running along the right side of the lower l ower receiver above the













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Assembling an AR-15

Installing the Bolt Catch

1.

2. 3. 4. 5.

Tap the bolt catch roll pin into the right side of the bolt catch mount, stopping before the pin emerges from the first bracket. Insert bolt catch spring. insert bolt catch buffer. Place bolt catch. While holding the bolt catch in position, tap the bolt catch roll pin through the bolt catch until it is flush. Figure 3: The Left Side of the Lower Receiver, Showing the Bolt Catch Above the Magazine Catch

Installing the Trigger

1. 2. 3. 4.

Wrap the trigger spring around the trigger. Insert the disconnector spring into the top of the trigger. Place trigger/spring assembly into lower receiver. Set disconnector into trigger.














Installing the Hammer

1. Wrap the hammer spring around the hammer. 2. Insert the hammer/spring assembly into the lower receiver so that the ends of the spring rest upon the trigger pin. 3. While holding the hammer/spring assembly in position, insert the hammer pin through the lower receiver and the hammer until the pin is flush on both sides of the lower receiver.

Figure 7: The Hammer with Hammer Spring in Place

Figure 8:The Hammer Pinned in Position

Installing the Trigger Guard

1.

Insert the end of the trigger guard with the













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Assembling an AR-15

Installing the Safety Selector

1. Cock the hammer. 2. Insert the safety selector through the left side of the lower receiver. 3. Place the safety selector detent into the hole below the safety selector on the right side of the lower

The detent and spring will not be secured until the pistol grip is installed. NOTE:

receiver. 4. Place the safety selector detent spring into the same hol e.

Figure 11: Safety Selector
















Installing the Takedown Pin

The detent, spring, and pin will not be secured until the buffer tube has been installed. NOTE:













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Assembling an AR-15

Installing the Buffer

1. Insert the buffer spring into the buffer tu be. 2. While depressing the buffer stop, insert the buff er into the buffer tube.

Figure 17: Buffer Held in Position by













Assembling the Upper



























The upper portion of the weapon, generally referred to as simply the upper , contains the barrel and the bolt carrier group, along with the upper receiver. It is the final portion of the rifle you will need to assemble. You will need to complete complete the following following steps: 1. 2. 3. 4. 5.

Attaching the Barrel Inserting the Bolt Carrier Group and Charging Handle Installing the Free-Float Handguard Pin and Secure the Gas Block Installing the Flash Hider

Attaching the Barrel

1.

Make certain any gas block the barrel may have is removed.















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Assembling an AR-15

Inserting the Bolt Carrier Group and Charging Handle

1.

Slide the charging handle into the back of the upper receiver and up into the charging handle track. With the charging handle half-way extended, set the bolt carrier key into the track on













Assembling the Upper Pinning and Securing the Gas Block

1.

Slide the gas block onto the barrel until the gas tube inserts into gas block. Align the gas tube and gas block so that you can see light

























Completing Assembly and Operation Check



















































How To Assemble an AR-15

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