Anderson Arms Gas Block AR-15

Product Description

The Anderson Arms Gas Block AR-15 is a low-profile gas block manufactured by Anderson Arms for standard AR-15 upper receiver builds. This component redirects propellant gas from the barrel into the gas tube to cycle the bolt carrier group.

Gas blocks are a critical link in the direct impingement system. A properly fitted block ensures reliable cycling across different ammunition loads and keeps your rifle running when it matters.

This Anderson gas block suits budget-conscious builders and armorers replacing worn or damaged parts. It works with standard AR-15 barrel gas ports and accepts mil-spec gas tubes.

Key Facts

• Brand: Anderson Arms
• SKU: AM-15-GAS-BLOCK
• Platform: AR-15/M16
• Category: Upper receiver gas system component

What Makes the Anderson Gas Block Different

Some buyers search specifically for an “anderson adjustable gas block,” but this model is a standard fixed gas block. Fixed blocks have no moving parts and require no tuning. They deliver consistent port pressure shot after shot.

Adjustable gas blocks let you restrict gas flow for suppressed shooting or fine-tune ejection patterns. Fixed blocks like this Anderson unit are simpler to install and lighter in weight. For most shooters running unsuppressed rifles with factory ammunition, a fixed block is all you need.

If you do need adjustability, send us a message and we can walk you through your options.

Installing an AR-15 Gas Block

Gas block installation requires you to slide the block over the barrel journal and align the gas port hole in the block with the port drilled in the barrel. Most blocks secure with set screws or a clamp mechanism.

Misalignment causes short-stroking and failure to eject. A gunsmith with a barrel vise and the right punches can seat the block square and confirm clearance inside your handguard. Western Sport offers gunsmithing services on site if you prefer professional installation.

Confirm the attachment method and gas tube compatibility before ordering. Send us a message to verify fit with your barrel and other gas blocks in your build plan.

Pairing This Gas Block with Other Upper Parts

Your gas block must match your barrel’s gas port diameter and journal dimensions. Standard carbine-length and mid-length gas systems use different block positions along the barrel.

The gas tube inserts into the block and runs back to the upper receiver’s gas key. Tube length must match gas system length: carbine, mid-length, or rifle. Mixing lengths creates headspace and timing problems.

Western Sport carries barrels and upper parts from multiple manufacturers. We can help you match components or source the right gas tube length for your build.

Ordering from Western Sport

Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: Is the Anderson gas block adjustable or fixed?

A: This Anderson Arms gas block is a fixed gas block, not adjustable. Fixed blocks provide reliable cycling without tuning and have no adjustment screws. If you need an adjustable gas block for suppressed use or fine-tuning, send us a message and we can discuss alternatives.

Q: Will this Anderson gas block fit my AR-15 barrel?

A: The Anderson gas block is designed for standard AR-15 barrels, but you must confirm your barrel’s gas journal diameter and gas system length before ordering. Gas block fit depends on these barrel specs. Send us a message to verify compatibility with your specific barrel.

Q: What gas tube length do I need with this gas block?

A: Gas tube length must match your barrel’s gas system length, either carbine, mid-length, or rifle. The gas block itself does not determine tube length; your barrel’s gas port position does. Measure from the upper receiver to the gas block location, or send us a message for help matching parts.

Q: Can I install this gas block myself or do I need a gunsmith?

A: You can install a gas block yourself if you have a barrel vise, alignment tools, and experience with AR-15 uppers. Misalignment causes cycling failures, so many builders prefer professional installation. Western Sport offers gunsmithing services; send us a message to schedule installation.

Q: Does Anderson Arms offer a warranty on this gas block?

A: Warranty terms vary by manufacturer and are not listed for this product.

Additional information