AR-15 – A5 Buffer Tube Kit – 8 Position
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
The CMC Triggers A5 Buffer Tube Kit is an 8-position extended receiver extension assembly for compatible AR-15 builds using an A5-length buffer system. It includes the tube, A5-style buffer, recoil spring, castle nut, and QD receiver end plate.
Fitment
- Fits compatible AR-15 lower receiver builds.
- Built for A5-length receiver extension setups.
- Uses an A5-style buffer system, not a standard carbine buffer tube length.
Does NOT fit
- Does not use the same buffer tube length as a standard AR-15 carbine setup.
- Does not include a buttstock.
- Do not mix buffer system parts unless you know the complete setup is compatible.
What it does
This kit gives an AR-15 build an A5-length 8-position receiver extension setup with an A5-style buffer. The longer receiver extension and included buffer system are intended to support a smoother, more controlled cycling setup when properly matched with the rifle.
Why it’s worth it
The A5-style system is for builders who want more than the basic carbine tube. It gives more stock adjustment range and a different recoil system feel when installed correctly. Good gear, but it has to be matched right. Random buffer mixing is how rifles start acting possessed.
Specs
- Brand: CMC Triggers
- Platform: AR-15
- Tube type: A5-length receiver extension
- Positions: 8 position
- Tube material: 6061-T6 aluminum
- Finish: Hardcoat anodized black
- Buffer type: A5-style buffer
- Buffer weight: 3.8 oz
- Includes high-quality recoil spring
- Includes castle nut and QD receiver end plate
What’s included
- 8-position A5-length buffer tube
- A5-style buffer
- Recoil spring
- Castle nut
- QD receiver end plate
Tools needed
Armorer’s wrench, receiver support, torque wrench if following exact build specs, and staking tool if staking the castle nut.
Install notes
Install as a complete A5-length buffer system and verify your stock and rifle configuration are compatible. After installation, confirm proper cycling, bolt lockback, and safe function before relying on the rifle.
Verify before you buy
Verify you want an A5-length setup, not a standard carbine buffer kit. This matters. A5 parts and carbine parts are not “close enough” just because they both live in the back of the rifle.
⚠ Install & Compatibility Disclaimer
Installation should be performed by a qualified armorer or gunsmith. Improper installation, modification, or use may affect firearm safety and reliability. Buyer is responsible for verifying compatibility, performing proper function testing, and ensuring safe operation.
