How to Pin And Weld Muzzle Device

If you have ever wondered how to pin and weld a muzzle device onto your AR-15, this guide is for you. Pinning and welding is the most secure way to attach a muzzle device, and it will also make sure that your muzzle device is properly aligned with the bore of your barrel. This process is not difficult, but it does require some special tools and materials.

  • Decide which muzzle device you would like to use and purchase it
  • Using a lathe, remove any existing threads or finishes on the barrel of your gun
  • Cut new threads if necessary
  • Measure the diameter of your muzzle device at the base and find a corresponding size drill bit
  • This will be used to make pilot holes for welding
  • Drill two or three pilot holes around the base of your muzzle device
  • For Tig Welding: Set up your welder with the correct settings for welding stainless steel (or whatever material your muzzle device is made from)
  • Apply weld bead around the circumference of each pilot hole, making sure to fill in any gaps completely
  • Wait for the welds to cool before moving on to the next step
  • For Mig Welding: Follow manufacturers instructions for set up and safety procedures specific to your welder and equipment
How to Pin And Weld Muzzle Device


Can I Pin And Weld Muzzle Device?

You may be able to pin and weld a muzzle device, depending on the type of device. If the device is made of steel or another metal that can be welded, you may be able to attach it by welding. However, if the device is made of plastic or another material that cannot be welded, you will not be able to attach it in this way.

You may still be able to pin the device in place, but it will not be as secure as if it were welded.

Can You Remove a Pinned And Welded Flash Hider?

If you have a pinned and welded flash hider, you will need to remove the pin and weld in order to remove the flash hider. Here is a step-by-step guide on how to do this:

1. First, use a drill bit that is slightly smaller than the diameter of the pin. Drill through the center of the pin until the bit comes out the other side.

2. Next, use a chisel or punch to drive the pin out from one side. You may need to tap it with a hammer to get it started.

3. Once the pin is removed, you can now remove the flash hider by unscrewing it from the barrel.

Does Muzzle Brake Need to Be Pinned?

Muzzle brakes are devices that are fitted to the muzzle of a firearm that redirects propellant gases to counter recoil and unwanted rising of the barrel during rapid fire. There are many different types of muzzle brakes, with some being more effective than others. One type of muzzle brake is the compensator, which vents gases upward to counteract the force of gravity on the bullet as it leaves the barrel.

Another common type is the linear compensator, which vents gases to the side to reduce felt recoil. Do muzzle brakes need to be pinned? The answer is no, but there are certain benefits to doing so.

For instance, if you pin a muzzle brake onto an AR-15 rifle, it becomes a permanent part of the firearm and cannot be easily removed. This can be advantageous if you live in a state with stricter gun laws, as it makes it more difficult for someone to convert your rifle into an illegal assault weapon. Additionally, pinning a muzzle brake can help increase accuracy by reducing barrel rise during rapid fire.

What is a Permanently Attached Muzzle Device?

A permanently attached muzzle device is a muzzle brake or flash suppressor that has been welded, pinned, or otherwise bonded to the barrel of a firearm so as to not be easily detachable. This is done for a number of reasons, most often to comply with state and federal regulations on short-barreled rifles (SBRs) and other NFA items. It also can increase the structural integrity of the muzzle area and help prevent accidental disassembly during cleaning or maintenance.

How to Pin & Weld


If you’re looking to attach a muzzle device to your firearm, there are two main ways to do it: pinning and welding. Both methods have their pros and cons, so it’s important to choose the right one for your situation. Pinning is generally the more permanent of the two options, as it involves attaching the muzzle device with small pins that go through both the barrel and the device itself.

This ensures that the device won’t be able to move or come loose over time. However, it can be difficult to remove a pinned muzzle device if you ever want to change it out, and you’ll need specialized tools to do so. Welding is a less permanent option, but it’s also much easier to do (and undo).

Simply weld the muzzle device onto the barrel using a welder, and then use a file or grinder to smooth down any rough edges. Keep in mind that welding can potentially damage your barrel, so it’s not recommended for expensive or high-end firearms. So which method should you use?

It really depends on your individual needs and preferences. If you want a more permanent attachment that won’t budge over time, go with pinning. If you’re not worried about making changes in the future and just want an easy way to attach a muzzle device, welding is probably the way to go.

  • August 30, 2022
Peter Jacobs

Peter Jacobs is the Senior Director of Marketing at CNC Masters. He is actively involved in manufacturing processes and regularly contributes his insights to various blogs on CNC machining, 3D printing, rapid tooling, injection molding, metal casting, and manufacturing in general.

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