Vltor A5 weights:
A5H0: 3.80oz
A5H1: 4.56oz
A5H2: 5.33oz
A5H3: 6.08oz
A5H4: 6.83oz

Vltor A5 assembly: A5H1 disassembled – this orientation is how it came from the factory.  Note the spring.  Single tungsten weight and 3 steel weights

Pictured below is an old MGI buffer where it also uses an internal spring like the Vltor A5.  In my case the spring on mine had broken.  

 Hydraulic buffers  – what I could not find anywhere was how stiff each hydraulic  buffer is to compress that is what I’m showing here.

The early Enidine’s are pretty stiff and I honestly never liked them in any configuration I have tested

The standard Kynshot RB5000 is similar to the early Enidine and likewise was never really impressed with it.

I think that both of the above hydraulics would be good for people with overgassed guns which I don’t have.


I consider the RB5005 a good alternative to the RB5007 when you want to reap the benefits of a hydraulic buffer but must use a carbine length buffer tube.

The RB5015HD is marketed by Blitzkrieg Components as their ‘High Dampened’ version for straight blowback 9mm variants.  I’ve tested this in the CMMG RDB in 9mm and .40SW as well as some other gas operated rifle calibers and didn’t really care for it over the RB5007.  My preferred use case for this buffer is in my DPMS GII .308 with a .308 Tubb Flat spring, A2 Rifle stock and custom Delrin spacer in the buffer tube to prevent overtravel.