SIG P320 9MM FULL SIZE BARRELS Reviews & Ratings

BROWNELLS SIG P320 9MM FULL SIZE BARRELS

Brownells SIG Sauer P320 9mm full-size barrels provide a new level of aftermarket support for owners of SIG's popular modular pistol platform, giving them the chance to do more and perform better with their handgun. The Brownells Sig Sauer P320 9mm full-size barrels are completely made in the United States from solid bar stock of 416-R certified stainless steel. The steel is completely relieved of all stresses and are threaded for suppressor use.

Rifled with 1:10 twist rate
Features 11-degree target crown
Thread pitch: 1/2x28 TPI
Nitride-treated for corrosion resistance
DOES NOT COME WITH THREAD PROTECTORS

The Brownells Sig Sauer P320 9mm full-size barrels also features conventional land-and-groove rifling instead of polygonal rifling.

NOTE: Does NOT work with LCI

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Reviews Summary

The SIG P320 threaded barrel receives mixed reviews. While some users appreciate its drop-in fit and commend its performance with suppressors, others face significant issues with chambering and reliability. Points of concern include improper threading for heavier suppressors and a lack of a thread cover. Overall, purchasers are advised to assess their specific needs and consider alternatives if issues arise.

What Reviewers Are Saying

Performance and Reliability

40%

Reviews are divided on the barrel's performance. Some users note that it functions well and chambers rounds effectively, while others report serious issues with feeding and compatibility with suppressors, indicating inconsistent reliability across different setups.

Compatibility with Suppressors

50%

Several reviewers mention difficulties when using heavier suppressors, with some stating that the barrel is not properly cut for suppressor use. While lighter suppressor options may work, customers are cautioned to consider spending more on better-suited products if suppressor performance is a priority.

Installation Ease

60%

Many customers find the installation of the barrel straightforward and easy, praising its drop-in fit. This aspect has been positively noted across several reviews, contrasting with those who struggle with fitment issues.

Lack of Accessories

30%

The absence of a thread cover is a noted drawback in some reviews, which may affect users' overall satisfaction. Customers appreciate completeness in product accessories and may see this as a missed opportunity for the manufacturer.

Initial Impressions

20%

Several reviews reflect initial satisfaction with the barrel, relating to fit and aesthetic qualities. However, many of these reviewers have yet to test the barrel thoroughly in practice, and therefore, their opinions may evolve once they gain more experience.

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320 full size threaded barrel

Ordered the barrel for the future of getting one of my 320's suppressed. As of now the barrel was a complete drop in and the performance is outstanding. It does Not come with a thread cover is the only drawback. I guess when the suppressor is installed you won't need one.

Best Priced Barrel on the Market

I bought a P320 X-Full RXP, and I planned to add a suppressor to it later on, but I couldn't find a competitively priced threaded barrel to go with it until a website I found recommended this product. I was unsure it would work, but luckily, I was able to install it without issues. For any eager buyers reading this review, I HAVEN'T FIRED IT YET, so stay tuned for my update. Barrel Length: 5.64" inches Threads/Length: 1/2x28 / 0.400" inches. It is compatible with X-Series pistols. UPDATE: I've successfully fired a group with the barrel, and it worked flawlessly. This barrel is good to go.

Very nice

I have not had the chance to shoot my P320 with this new barrel yet but it fits perfectly. Looks good and fits the suppressor with no problem.

Great Alternative to Expensive Brands

I bought a P320 X-Full RXP, and I planned to add a suppressor to it later on, but I couldn't find a competitively priced threaded barrel to go with it until a website I found recommended this product. I was unsure it would work, but luckily, I was able to install it without issues. It will fit X-Series pistols. For any eager buyers reading this review, I HAVEN'T FIRED IT YET, so stay tuned for my update. Barrel Length: 5.64" inches Threads/Length: 1/2x28 / 0.400" inches

Not for use with suppressor(at least if its heavy)

This is indeed a threaded barrel for the Sig P320... but what it doesn't mention is that its not cut properly for use with a suppressor. I installed this barrel and fought with it trying 6 different power springs trying to get it to work with my suppressor. Ultimately, replacing this barrel with a silencerco barrel solved my issues. This may work for very light suppressors, but if your suppressor weighs more than a couple ounces, spend a bit more on the SiCo barrel so you get something that actually works well with your can.

by Andy on March 03, 2025

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Does not even chamber a round

Unfortunately I couldnt get this barrel to chamber a round except by manually dropping one directly into the barrel. It would not even come close to feeding and would stop half way up the feed ramp causing the round to mar or dent. I understand that sometimes you need to work in parts to get the right fitment but this was nowhere close to being able to work properly. Cannot recommend and will instead try out a factory barrel.