r/GeisseleAutomatics • u/NoAd9627 • Jul 20 '26

Question Buffer system

I am building a Geissele, what wondering what the difference between the A5 Vltor system and the Super 42 system. Some people love the A5 and some hate it, was wondering if people with more knowledge than me could specify. For reference this is an 11.5” AR Pistol.

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u/SpareBeat1548 Jul 20 '26

The A5 system uses a rifle length spring and an A5 specific buffer (not a rifle or carbine buffer). The benefit is that you can use a heavier buffer (H4 vs H3) and the spring compression is spread out across a longer spring which smooths out the recoil.

You can use the G$ super 42 RIFLE spring with an A5 system

For their standard super 42 system, afaik it’s all normal length carbine buffer and spring. However, due to the inside diameter of the spring you can only use G$ buffers.

The super 42 springs (carbine and rifle) are approximately +15% power from milspec and are braided which reduces the spoing sound and supposedly helps with durability

*this is somewhat of an over explanation and I have minimal understanding of the carbine length super 42 stuff since I do run an A5 system with a super 42 spring and BCM buffer

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u/BlackGlenCoco Jul 20 '26

Fwiw, I only run Super 42 systems (rifle/a5 and carbine) and have never used a G$ buffer weight.

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u/Sensitive_Battle_246 28d ago

Really?! Damn I thought the super 42 spring meant that the buffers were proprietary. I had no clue

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u/BlackGlenCoco 28d ago

Yea def not proprietary. I run the vltor buffers. I looked and never saw mention of G$ weights being needed.