What’s the Standard AR-10 Barrel Thread Size?

General
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AR-10 Barrel Thread Size Inquiry

I’ve been looking into building my own AR-10 and realized that understanding the barrel thread size is crucial for compatibility with various muzzle devices and suppressors. I’ve come across some conflicting information, and I’m hoping to clarify a few things.

Common Thread Sizes

From what I’ve found, the standard thread size for AR-10 barrels is generally accepted to be 5/8x24. However, I also see mentions of different specifications in discussions, which leaves me a bit confused.

Why it Matters

When it comes to attaching accessories, having the accurate thread pitch is essential. If the threads don’t match, you could end up with a muzzle device that just won’t fit, which is definitely not ideal.

Questions I’m Considering:

  • Are there variations in thread size based on different manufacturers?
  • Are there specific muzzle devices known to fit AR-10s that I should consider?
  • What are the potential issues I could encounter during assembly if I mistakenly mismatch the barrel and the accessory?

Additional Thoughts

If anyone has experience with different AR-10 builds, I’d appreciate any insights or recommendations you might have regarding barrels and compatible attachments. It’s been tricky navigating this on my own, and I’m sure I’m not the only one who’s run into similar questions.

Looking forward to your thoughts!

Thanks in advance for the help!

7 Likes
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The standard thread size for an AR-10 barrel is typically 5/8-24. It’s crucial to match this with your muzzle device to ensure proper fitment.

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Great info! I didn’t realize how important it is to match those sizes! What happens if you mix them up?

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Mixing thread sizes can lead to loose fittings or even damage the threads over time. Stick to the specifications for your AR-10 and you’ll be fine!

5

That sounds risky! Are there other common thread sizes I should know for accessories?

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Aside from 5/8-24, the other common sizes you might encounter are 1/2-28 and M14x1. Make sure to check the specifications of your attachments!

7

That’s good to know! How can I identify the thread size of my existing barrel?

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You can measure the threads using a caliper or check your manufacturer’s specs. Most AR-10s will have this info in the manual.

9

Manuals are such a lifesaver! Just last week I had a similar question about my rifle setup. Did I mention how lost I felt? Anyway, thanks for the tip!

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I can’t find my manual! Is there a universal way to check thread sizes?

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A thread gauge can help you find the right size. They’re pretty inexpensive and a handy tool to have in your kit!

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I love tools that serve multiple purposes! Any brands to recommend?

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13

I’ve had good luck with Brownells and Hennings, they have quality thread gauges that are reliable.

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Thanks! I’ll check those out. Is there a point in going for an expensive gauge?

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More expensive gauges tend to be more durable and accurate, but for a hobbyist, a mid-range option usually suffices!

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It’s wild how something as small as threads matters so much! But hey, at least we can have a little fun figuring it out, right?

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The standard thread size for most AR-10 barrels is 5/8"-24. This is crucial for ensuring compatibility with your muzzle devices and suppressors. Make sure to double-check before purchasing a new barrel!

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That’s right! It’s also important to consider the specifics of your rifle platform, as some variations might exist. Do you have a particular brand or model in mind for your barrel?

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When selecting a new barrel, look for reputable manufacturers like Faxon, Criterion, or Douglas. They have a solid track record for quality and performance.

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Absolutely! I’ve had great experiences with Ballistic Advantage too. Their AR-10 barrels are consistent and reliable.

3 Likes