Cant find much material on these so I thought Ide ask the pro circle. According to the description these can be used on any gas system? With what results?

uses an intermediate length BCM® receiver extension machined from 7075T6 Aluminum, A M16 rifle action spring, and a Vltor A4 buffer.
These components are intended to work as an improved buffer system that can be used on rifle with carbine, mid-length, and rifle length gas systems.

Please note, the components in this system are NOT intended to be mixed with buffer, action springs, and receiver extensions of a traditional M4 carbine buffer system.

The BCM® Intermediate Buffer System (A5) Kit includes:

Vltor A5H0 Buffer (3.8oz)
BCM® Intermediate Receiver Extension Tube
BCM® QD End Plate
Milspec Castle Nut
Rifle Action Spring

Developed from the USMC/VLTOR kit and it does work.

If it is right for you, I cannot say.

Big Army developed the H6 buffer instead, so they can issue a kit to convert A2/A4 rifles over to a collapsible stock using the std. collapsible receiver extension.

What are you trying to do?

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I would spend $5 more and get the VLTOR tube with markings on top.