Most muzzle devices need to be timed, or aligned correctly, to get the most out of the device. Here is the upper with the handguard installed.
#Ar 15 a2 carry handle assembly install#
Following the manufacturer’s instructions, we install the Troy Alpha Rail.Ģ0. Make sure the gas tube does not come in contact with the barrel nut and that the gas block is tightened in place.ġ9. Following the manufacturer’s directions, we tighten the set screws to their specs.ġ8. Depending on what type of gas block you get, some attach with set screws, some with pins, some require high-temperature thread treatment such as Loctite or Rocksett. You can verify this by measuring the gap between the shoulder and gas hole on the barrel and also the gas hole and end of the block on the gas block.ġ7. Some gas blocks may require a slight space between the gas block and the shoulder others will not. The gas block will sit at the gas block shoulder that is cut into the barrel.ġ6.
Now take the gas block assembly and slide it onto the barrel. Don’t fudge this the gas tube hole has to be perfectly clear of the teeth.ġ5. We also recommend using as little torque as you can because the more torque that is used, the harder it will be to remove later on and the more chance your receiver can get tweaked, but don’t go any lower than 30 lb-ft.ġ4. It is recommended to brace the wrench with your hand at the barrel nut so that the wrench doesn’t slip off. You may find that it’s easier to do this in stages torque the nut, then back it off a couple of times.ġ3. Using between 30 to 80 lb-ft of torque, tighten the barrel nut so that one of the gaps between its teeth clears the gas tube hole on the receiver perfectly.
Take the armorer’s wrench and attach the torque wrench to it.ġ2. Tightening the barrel nut onto the receiver is essential to seating the barrel correctly. You want a gap between the teeth to align with the hole, as this is where the gas tube will go.ġ1. Taking a look at it dead on from the front, you’ll see that the teeth of the barrel nut may not align properly with the receiver’s gas tube hole. Hand-tighten the barrel nut onto the receiver.ġ0. A light coat is fine, don’t gunk it on.ĩ. With a dab of antiseize on your finger, rub the compound so that it covers all the threads of the barrel nut. If you ever want to take the barrel off the receiver in the future, it’s a good idea to lube up the threads of the barrel nut so that it doesn’t seize. The basic principle of installation is the same, but follow the instructions that come with your choice of handguard. Other handguards may come with proprietary barrel nuts. The handguard we are installing uses a standard AR-15 barrel nut, so that’s what we’re using. The pin corresponds to a notch cut into the front of the threaded portion of the upper receiver.Ĩ. Be sure that the pin sticking out of the barrel extension is pointed up, at the 12 o’clock position.ħ.
With the upper receiver assembly mated to the receiver block in the vise, take the barrel and insert it into the receiver. After the pin is flush with the surface of the gas block, set the assembly aside for later use.Ħ. The gas tube will want to shift around as you work, so be careful to adjust the holes back into alignment as you go.ĥ. Using the roll pin punch and hammer, drive the roll pin into the gas block and tube while being mindful that the gas tube doesn’t shift position. You’ll also notice that there’s a bend in the gas tube make sure that it goes upward toward the rear.Ĥ. Make sure you see daylight out the other side of the roll pin holes.ģ. Insert the gas tube into the gas block making sure that the roll pin holes are aligned and the gas hole is pointed downward, in line with the corresponding hole of the gas block. The larger one lines up with the gas port and the two small ones are for the gas tube roll pin.Ģ. Take a look at the plugged end of the gas tube. While doing that, thread the pin through the port cover and spring.ġ. With the snap ring portion of the hinge pin to your right, feed the pin into the receiver’s right side ejection port cover hole going from right to left. If your pin doesn’t have it installed, go ahead and do that now.Ģ. The hinge pin has a tiny snap ring installed on it. We’ll begin with installing the Ejection Port Cover Assembly into the receiver. There are a few basic specialized tools that you will need to properly assemble an upper receiver.Ģ.