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"Ar 15 upper assembly instructions"

Ar 15 upper assembly instructions pdf

by: Janiya V.
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Dec 19, - step-by-step guide on to How to build an AR upper receiver. How to install forward assist, dust cover, barrel, gas system, handguard and. So, you're ready to build an awesome upper receiver for your AR? You might wonder how difficult the process is. Our ultimate guide will explain the process. How To Build an AR Rifle in detailed step-by-step instructions with photos and instructional videos are Ar Upper Assembly (without Barrel Assembly).


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We're sorry, midwayusa. Learn how you can enable Javascript. Before you buy your first part, decide what kind of rifle you want. Will you be varmint hunting, plinking or competition shooting? Once you make this decision, you know what type of upper receiver and barrel you will use.

The upper receiver and barrel you choose will determine the remaining parts needed. Here are several types of stripped upper receivers, each with different features for different applications. Has a fixed carry handle, shell deflector and requires the installation of the forward assist assembly, ejection port cover assembly and the A1 sight assembly that allows only for windage adjustment.

This upper is ideal to build a "Retro" civilian version of the Vietnam era M Rifle.. Has a fixed carry handle, shell deflector and requires the installation of the forward assist assembly, ejection port cover assembly and the A2 sight assembly that allows for windage and elevation adjustments.

This is a popular upper to use for building a rifle for use in shooting matches. Has a flattop with picatinny rail, shell deflector and requires the installation of the forward assist assembly and ejection port cover assembly. This is the current military upper and is used to build a civilian copy of the M4 carbine with 16" barrel or M A4 rifle with 20" barrel. Has many configurations for the upper receiver with various heights of picatinny rails for mounting scopes.

These generally do not accommodate the forward assists or Ejection Port Cover assemblies or also known as the "Slick-Sided" uppers. For your project, we decided to build a Varmint Rifle in Ruger. Since we want to scope your rifle, we do not want an upper receiver with a carry handle, nor do we need open sights. That rules out the AR A1 and A2.

Therefore, either the AR A3 or the Flattop will do. We chose the A3 because of its versatility. In addition, since we are building a Varmint Rifle designed for accuracy, we want to install a bull barrel with a free-float hand guard. Now that we have selected the type of upper receiver A3 , we know we need the forward assist assembly and Ejection Port Cover assembly. These parts would not be required had we selected a Flattop. In addition, since we are using a bull barrel with a free-float hand guard and without sights, we need a gas block but do not need a flash hider.

Had we decided to use open sights, your front sight would have had the gas block built in. The free-float hand guard does not require the use of a delta pack or hand guard cap, as these are integral to the Free Float Tube hand guard. Make sure you have a good AR schematic to use as a guide in assembling your upper assembly.

The schematic is helpful in finding the correct names of parts and determining what they look like. Start the Forward Assist Pin into the bottom of the Upper Receiver so it stands on its own it is always a good idea to drive punches or hammer on the side that is least visible.. Insert the Forward Assist Assembly, make sure the pawl is oriented toward the middle of the receiver.

While compressing the Forward Assist Assembly, drive the pin through until it is flush with the receiver. Once the pin is firmly started, you should not have to hold the forward assist in place and you can use a large brass punch to drive the pin in until it is barely sticking up. If you find this too awkward, you can use a small punch as a slave pin to keep the Forward Assist Assembly compressed so you can use both hands.

You may have to take a small punch and drive the pin a bit further until it is flush or even slightly recessed just look at both sides to try and center the pin in the Upper Receiver.

Test the Forward Assist to make sure it moves freely in and out when compressed. Forward Assist Assembly is now installed. Be sure to make a direct, downward strike on the snap ring.

This is also a good time to check and make sure your safety glasses are still on. Lay the Upper Receiver on its side so the Ejection Port is facing up and the Barrel Threads are pointing to the right as you stand over the Upper Receiver. Barely start the Ejection Cover Pin so it stays in place on its own, making sure the end without the snap ring is started first.

As you hold the spring under tension, place the long end on the right side of the Ejection Port Cover closest to the Ejection Port Cover Pin that is part way through the assembly , while still holding on with your left hand, and slide the Ejection Port Cover Pin the rest of the way through, until the Ejection Port Cover Pin Snap Ring stops your progress. The Shilen Barrel we selected is Match quality and the manufacturer headspaces and numbers the Bolt included with the barrel to each Barrel.

Push the bolt all the way into the end of the Bolt Carrier; making sure the hole through the middle of the bolt aligned with the holedirectly under the BoltCarrier Key hollowtube that is attachby two screws to theBolt Carrier. Masure the bolt is positioned so that theextractor is on the left side of the bolt when looking at the bolt face.

If the Bolt Cam Pin will not go into the bolt, check the bolt orientation, as it may need to be rotated degrees. Insert the Firing Pin Retaining Pin through the Bolt Carrier making sure the round end of the pin is nestled all the way into the large recessed side of the Bolt Carrier. Since the Bolt Carrier is hollow, the Firing Pin Retaining Pin needs to go through the hollow part of the inside of the Bolt Carrier and enter the hole on the other side before it emerges on the other side. It can be a little tricky to achieve this alignment and pounding on the pin will not help.

Once in proper alignment, this pin should slide in easily. To complete the assembly of the Upper Receiver, you can go ahead and install these parts to ensure proper fit. However, you will have to remove these parts to continue with the installation of the Barrel Assembly. Turn the Upper Receiver upside down so that the Picatinny rail is against the work surface.

Slide the Charging Handle Assembly in only far enough that it will stay stationary on its own. Insert the Bolt Carrier Assembly with the bolt face pointing toward the barrel threads into the Charging Handle Assembly so that the Bolt Carrier Key rides in the trough on the underside of the Charging Handle, stopping when the Bolt Carrier Assembly and the Charging Handle Assembly are parallel and even with each other. The Ejection Port Assembly should pop open.

When you do this the Ejection Port Cover will pop open. This insert keeps the Upper Receiver from being crushed when you tighten it into the Vise. Slide the Barrel into the threaded end of the Upper Receiver.

Make sure the pin on the Barrel lines up with the slot in the Upper Receiver. Slide Barrel all the way into the Upper Receiver until the pin hits the back of the slot. If you are installing another type of handguard, instructions may vary. Coat barrel threads lightly with anti-seize or white lithium grease to keep the threads from galling. Unscrew the Outer Receiver Nut past one full rotation, stopping when the gas hole on the Outer Receiver Nut is lined up with the gas hole on the Upper Receiver.

Coat Inner Barrel Retainer Nut threads lightly with anti-seize grease or white lithium grease to keep the threads from galling. While holding the Outer Receiver Nut with one hand to keep the gas holes in alignment, thread on Inner Barrel Retainer Nut and hand tighten. Step 8 Please note that the manufacturer of the Free Float Handguard Tube we chose recommends that you coat the Upper Receiver Threads with Loctite and let it sit over night so the gas holes stay in alignment when you install the Inner Barrel Retainer Nut.

We skipped this step, as it will permanently install the Outer Receiver Nut. If you are not able to do this, Loctite will be necessary. Attach Takedown Wrench to the Inner Barrel Retainer Nut, making sure at least two of the pegs on the wrench are firmly inserted into the gas tube grooves on the Inner Barrel Retainer Nut. Do not over tighten. If you are not using Loctite, make sure you hold onto the Outer Receiver Nut so the gas holes stay in alignment.

Seat the Threads recommended in the U. Marine Corps Technical Manual. NOTE: With this particular handguard, if you cannot line up the gas holes within the torque range of ft-lbs, loosen the Inner Barrel Retainer Nut and loosen the Outer Receiver Nut another full revolution and try again. You cannot do this if you used Loctite.

Check to make sure Gas Tube slides freely through gas holes. Make sure the end with the three holes these are for the Gas Tube Roll Pin and gas hole going into Barrel is on the end where the Gas Block will be.

This only takes a minute or two. Barely tighten set screws on the Gas Block so it will stay in place, but you can still rotate it by hand. Orient the Gas Block so the gas hole in the Gas Tube and the gas hole in the Barrel are perfectly aligned. To do this, remove Sling Swivel Stud from retainer nut. Screw Sling Swivel Stud into retainer nut. AR A1 Has a fixed carry handle, shell deflector and requires the installation of the forward assist assembly, ejection port cover assembly and the A1 sight assembly that allows only for windage adjustment.

AR A2 Has a fixed carry handle, shell deflector and requires the installation of the forward assist assembly, ejection port cover assembly and the A2 sight assembly that allows for windage and elevation adjustments.

AR A3 Has a flattop with picatinny rail, shell deflector and requires the installation of the forward assist assembly and ejection port cover assembly. AR Flattop Has many configurations for the upper receiver with various heights of picatinny rails for mounting scopes.

Video Library. Step 2 Turn Upper Receiver upside down so the picatinny rail is against the work surface. Step 4 Start the Forward Assist Pin into the bottom of the Upper Receiver so it stands on its own it is always a good idea to drive punches or hammer on the side that is least visible..

Step 5 Insert the Forward Assist Assembly, make sure the pawl is oriented toward the middle of the receiver. Step 7 While compressing the Forward Assist Assembly, drive the pin through until it is flush with the receiver. You may have to take a small punch and drive the pin a bit further until it is flush or even slightly recessed just look at both sides to try and center the pin in the Upper Receiver Step 8 Test the Forward Assist to make sure it moves freely in and out when compressed.

Step 8 As you hold the spring under tension, place the long end on the right side of the Ejection Port Cover closest to the Ejection Port Cover Pin that is part way through the assembly , while still holding on with your left hand, and slide the Ejection Port Cover Pin the rest of the way through, until the Ejection Port Cover Pin Snap Ring stops your progress.

Step 9 Close the Ejection Port Cover, making sure it snaps shut. Ejection Port Assembly is now installed. Step 2 Push the bolt all the way into the end of the Bolt Carrier; making sure the hole through the middle of the bolt aligned with the holedirectly under the BoltCarrier Key hollowtube that is attachby two screws to theBolt Carrier.

Step 5 Insert the Firing Pin Retaining Pin through the Bolt Carrier making sure the round end of the pin is nestled all the way into the large recessed side of the Bolt Carrier. Test the bolt to make sure it moves in and out of the Bolt Carrier freely. Step 5 AR Charging Handle is now completed.

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This section covers the assembly of the ejection port cover, the forward assist, the charging handle, the A1 sight and the A2 sight. You can watch only those clips that pertain to your specific rifle and skip the others if you choose. If you would like a copy of the chat transcript please click "Send Transcript" below. Hello, to begin a chat session with a customer service representative, complete the fields below and click Chat.

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Assembling the Upper Receiver Introduction Installing the Ejection Port Cover Assembling the Forward Assist Plunger Installing the Foward Assist Installing A1 Sights Installing A2 Sights Section 3. Main Menu. Section 5. Table of Contents. Check list for ordering parts.

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Assembling the Upper Receiver - Section 4 This section covers the assembly of the ejection port cover, the forward assist, the charging handle, the A1 sight and the A2 sight. We’ll provide you with some helpful tips and methods for function checking each subassembly as you build your upper receiver. AR Upper Assembly, 16″Stainless Steel Barrel,15″ Keymod (No BCG and Charging Handle) from: $ 99 $ 99 AR 15 Upper Assembly ″ Black Quad Rail – NO BCG. AR Complete Upper Assembly, 16" Parkerized M4 Barrel, Twist, Carbine Length Gas System, " SMF Tactical KeyMod Rail MSRP: Sale Price - $