Introducing the new MEAN Arms Bearing Delay™ upper receiver in 9mm.
The Bearing Delay Upper Receiver is a complete upper receiver system ready to be paired with the AR lower receiver of your choice. Available in 5 different barrel lengths: 4.5", 7.5", 11", 14.5", 16" - all threaded for a 1/2-28 muzzle device. No 9mm-specific buffer needed. The Bearing Delay Upper Receiver is designed to work with standard AR-15 buffers.
The heart of the Bearing Delay Upper Receiver is the unique ball bearing bolt carrier group (BCG). The ball bearings interface with corresponding features in the barrel extension and provide the lockup in battery and the delay after firing. The system can be tuned by replacing the Lifter to change the angle of the surfaces that push the bearings from the inside of the BCG. The bolt face includes our unique center ejector to provide the most consistent ejection of any 9mm AR on the market. The firing pin passes through the ejector.
Take all the benefits of roller delay: reliability, durability, low recoil and combine with the familiarity of the AR-15 platform. Rollers are obsolete. Each of our ball bearings has the same contact surface area of the original MP5 roller. So with our 3 bearings, we have 50% more contact surface area than a traditional roller delay. This means that even with the higher pressures of modern ammunition, the Bearing Delay system has greater durability than any roller delay.
The ability to tune the system by swapping the Lifter means that the Bearing Delay™ system can be tuned based on ammunition type, barrel length, suppressor, or any other factor. Each Bearing Delay Upper Receiver includes two Lifters.
If you elect to use MEAN Arms Endomags (Ejectorless), the Bearing Delay Upper Receiver is compatible with milspec lower receivers OR you can use dedicated pistol magazine lower receivers. Most pistol magazine lower receivers will need to have the stationary ejector removed to be compatible with the Bearing Delay system.
Each Bearing Delay Upper Receiver includes 2 Ejectorless Endomags.
MA Upper Receiver
The Bearing Delay Upper Receiver includes a slick side billet machined aluminum upper receiver that adheres to milspec standards. No forward assist.
The new MA Handguard is a free float hybrid design including a very rigid high temperature and high strength polymer body with a metallic insert that is overmolded (permanently attached) within the handguard and threads onto the specially designed barrel nut.
Internal width (flat to flat): ~1.375"
Available in 5 lengths based on the barrel configurations of our Bearing Delay Upper Receiver.
MA Charging Handle
The MA Charging Handle is a new ambidextrous design incorporating both steel and aluminum machined components.
MA Muzzle Device
The new MA Muzzle Device reduces recoil and muzzle flash. Comes with a left-hand threaded jam nut which eliminates the need for a crush washer. Note: those selecting a 14.5" barrel upper will have the option to select whether the muzzle device should be permanently attached or not.
Every Bearing Delay Upper Receiver includes the MEAN Lifetime Warranty so we will always fix or replace it. We also include free maintenance for life (including parts and labor) as long as customers pay for shipping.
All NFA Rules Apply.
The customer is responsible for understanding all applicable federal, state, municipal, and/or other laws/regulations for purchasing, owning, or using these products. These products are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.
It is exclusively the customer's responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length less than 16". Federal NFA regulations are applicable to this item when configured with a barrel length less than 16".
WARNING: This product and handling firearms or firearms parts can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm including lead, lead compounds, and petroleum products. For more information, go to www.P65Warnings.ca.gov.
- Caliber: 9mm Luger
- Compatible with both milspec AR-15 and dedicated pistol-magazine lower receivers
- Works with standard AR-15 buffers
- 5 available barrel lengths: 4.5", 7.5", 11", 14.5" and 16"
- Each Bearing Delay Upper Receiver includes:
- Fully tunable ball bearing bolt carrier group
- MA Upper Receiver - slick side billet machined aluminum upper receiver
- MA Handguard - free float hybrid metal/polymer design
- MA Charging Handle - new ambidextrous design
- MA Muzzle Device - exclusive machined design reduces recoil and muzzle flash
- Also included with the purchase of the Bearing Delay Upper Receiver:
- 1 additional Lifter for tuning the system (2 total included)
- 2 Ejectorless EndoMags (PMAGs NOT included)
- This product carries a MEAN Lifetime Warranty! If you have an issue please contact our support department via email at firstname.lastname@example.org. We are here to help!
- All maintenance for the Bearing Delay upper is free (including parts and labor) - customers only pay for shipping