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9mm Barrels

Shop all AR-15 9mm barrels.

Rainier Arms Select 9MM AR-15 Barrel - 4"

4.0 star rating 1 Review

$150.00
Four Payments of $37.50 with . Learn More

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Rainier Arms Select 9MM AR-15 Barrel - 10.7"

$180.00
Four Payments of $45.00 with . Learn More

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Rainier Arms Select 9MM AR-15 Barrel - 6"
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4.8 star rating 30618 Reviews

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Verified Reviewer

0.0 star rating

06/26/25

Review by Anonymous User

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06/26/25

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Edwin J.
Verified Buyer

5.0 star rating

06/24/25

Best forgrip

Review by Edwin J. on 24 Jun 2025 review stating Best forgrip
High recommended Buy 2

On A3 Industries Aluminum Modular Vertical Foregrip w/ Integrated Hand Stop - M-LOK 2" Smooth Grip

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06/24/25

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Edwin J.
Verified Buyer

5.0 star rating

06/24/25

Happy

Review by Edwin J. on 24 Jun 2025 review stating Happy
100% worth the money , perfect fit and the lower shipped next day will definitely buy again

On Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - K Push-Pin

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06/24/25

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Casey
Verified Buyer

4.0 star rating

06/24/25

Great large frame AR option

Review by Casey on 24 Jun 2025 review stating Great large frame AR option
The fit and finish on the receiver set is great. I’ve built on seekins, Geissele, and SiCo AR15 receiver sets, but this set is the best fitting. I would’ve given it 5 outta 5 stars, but when I built up the gun I’ve had some annoying issues with Centurion’s hand guard and their Customer Service. They are working to get issues resolved, but there has been multiple issues in a month long resolution. Not a dig on the receiver’s quality or Rainier in getting it shipped to my ffl in a timely fashion because both were solid.

On Centurion Arms MK11 7.62 Ambidextrous Billet Receiver Set - Black

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06/24/25

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RG2
Verified Buyer

5.0 star rating

06/21/25

Staccato CS W/PMM Comp

Review by RG2 on 21 Jun 2025 review stating Staccato CS W/PMM Comp
Sent my CS to Staccato to add a threaded barrel with the intent of adding a comp. Decided on a PMM comp as they had one specifically for the C model. Both the the C and CS are the same at the muzzle but this was listed as not working on a CS due to the shape of the guide rod end as mentioned on another review. As the slide racks the corners of the stock guide rod would make contact with the comp hence not compatible. The DPM System not only fixed this but gave me the opportunity to dial it in. I am very pleased with this set up. It has been great with no issues and is an improvement over stock. The fit and finish are top notch!

On DPM Systems Technologies Mechanical Recoil Reduction System - Staccato CS 3.5″ Bull Barrel

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06/21/25

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David B.
Verified Buyer

5.0 star rating

06/20/25

❤️Rainier Arms Rock !

Review by David B. on 20 Jun 2025 review stating ❤️Rainier Arms Rock !
Waiting list paid off ! Most other vendors would have put it on the auction site for twice as much

On Knight's Armament Company (KAC) Barrel Extension Action Wrench

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06/20/25

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