Phase 5 Weapon Systems AR-15 Pistol Buffer Tube Assembly

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The Perfect Buffer Tube Assembly For Your Pistol Caliber Rifle

The Phase 5 Weapon Systems AR-15 Pistol Buffer Tube Assembly has everything you need to get the backend of your AR pistol in working order. The complete package includes a billet aluminum buffer tube, a foam pad constructed of ultra-durable nitrile rubber, a Mil-Spec endplate, and a castle nut.

It works great with the SB Tactical Pistol Stabilizing Braces and offers a nice snug fit to ensure there’s no unwanted brace movement during pistol operation. It also allows any desired brace position with zero restrictions, all the way forward or as far back on the tube as you would like.

Extremely Durable & Lightweight

The buffer tube itself is made from 7075-T6 aluminum making it lightweight but also extremely strong and then finish with a hard-coat anodizing for ultimate wear and corrosion resistance. It is compatible with Mil-Spec carbine buffer and spring, and the lower slot is machined to accept all Mil-Spec end plates and sling mounting accessories.

The foam pad also provides another layer of protection for your buffer tube which is made of nitrile foam that efficiently resists oil and solvents.

NOTE: Compatible with SB Tactical Braces that accept round tubes. Not compatible with adjustable braces (ie: SBA3, SBA4, PDW)


  • CNC machined aluminum buffer tube to fit Mil-Spec carbine buffer and spring.
  • Machined lower slot to accept all Mil-Spec end plates and sling mounting accessories.
  • The Buffer Tube Foam Pad is made from NPVC also known as NBR or Nitrile. The temperature range of this foam is –20F to +220F.
  • Made in the U.S.A.


  • Material: 7075-T6 Aluminum
  • Finish: Mil-Spec Type III Hardcoat Anodized
  • Length: 7 3/8″
  • Diameter: 1.25″
  • Weight (Buffer Tube): 5.19 oz.
  • Weight (Buffer): ~3 oz.

Package Includes:

  • 1x Phase 5 Tactical AR Pistol Buffer Tube
  • 1x Mil-Spec Carbine Buffer Spring
  • 1x Standard Mil-Spec carbine buffer.
  • 1x Mil-Spec End Plate
  • 1x Mil-Spec Castle Nut
  • 1x Foam Rest Pad

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Phase 5 Warranty

All parts should be installed by a licensed, experienced GUNSMITH. You must consider the importance of every aspect involved with a proper installation. Improperly installed components can cause malfunctions, weapon failures, serious injury, or even death. PHASE 5™ WILL NOT WARRANTY COMPONENTS DAMAGED BY CUSTOMERS DURING INSTALLATION. All Phase 5 WSI assemblies and components have a lifetime warranty against any manufacturing defects.

Warranty Issues: email with the details of the issue you are experiencing. Please include your name and contact information.

Return & Exchange Policy

You must contact us within 30 days from the date of purchase for any returns or exchanges. Email to request a Return Merchandise Authorization Form. Please include your name, contact information, and order number. All returns and exchanges must be in original condition. Any product returned DAMAGED/USED is subject to a 20% refurbishing fee. We do not accept returns or exchanges for apparel. The customer is liable for all shipping charges on non-defective items.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 1 review
Jim Mccarthy
It’s sick looking bro!

Turns your AR into a awesome little boom stick! Pew pew!!

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.