Geissele Automatics Super 42 Rifle Length Spring

Manufactured by Geissele Automatics
SKU: 04-308
MPN: 04-308-F
Manufactured by Geissele Automatics
8 Reviews

In Stock

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The Geissele Automatics Super 42 Braided Wire Buffer Spring features a unique three-strand braided design similar to the legendary German MG42 machine gun. This arrangement allows for better energy absorption and harmonic dampening by allowing the springs to flex separately against each other, increasing the reliability and improving the function of your AR-15.

  • Rifle length
  • Designed after the MG42 machine gun recoil spring
  • Provides a longer spring life and more reliable function
  • Triple-strand braided wire
  • Dampens harmonics
  • Superior energy absorption

Geissele Automatics manufactures confidence, offering quality triggers and components for the warfighter and competitor. They were established in 2004 with the mission to build the highest quality, reliable triggers for competition and their first trigger, the Hi-Speed National Match trigger, was so popular that they were asked by the Department of Defense to produce a select-fire trigger for the United States Special Operations. Again, it was a success and Geissele decided to bring a semi-automatic version to the civilian market for law enforcement and personal protection.
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BrandGeissele Automatics
MaterialPiano Wire
TypeAction Spring - Rifle Length
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

8 reviews

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Unique product with wrong description

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The last line of the product description say it comes with a buffer but in the picture there is none. I'm assuming that the price of $25 means it is without the buffer and the description is wrong.
<br>From PA Customer service: Thank you for your feedback, we have corrected the description.

Awesome upgrade for improved performance, reliability and longevity.


Bought this for an Aero Precision M16. That rifle will not cycle. I have cleaned and oiled everything and even tried different BCG's from Noveske, DD and BCM. None helped and i knew it was the buffer spring. Perhaps the buffer tube itself is out of spec, i don't know but the spring seems incredibly weak to me. The Geissele is a night and day difference in strength and feel. I highly recommend it. To be honest, as soon as i charged the rifle with the Geissele in it, i smiled and said, WOW !!
<br> I will be going out to shoot it in a couple weeks and if it doesn't fix the issue i'll be shocked.

Love this buffer spring


Purchased for new AR-15 build. I've used a mil-spec buffer spring, a flat wire buffer spring, and now the Geissele Super 42. Even with an adjustable gas block, I didn't care for the mil-spec spring in the least. While the flat wire spring didn't have the bounce of the mil-spec, and had reduced recoil vs the mil-spec spring, it still has the spring twang. However, the Super 42 spring does not have the bounce of the mil-spec, has even more recoil reduction than the flat wire spring, and the twang is gone. I just purchased a second one of these and another adjustable gas block for use in my older 308 build, cannot wait to tame that recoil a bit!!!
<br>I would definitely recommend this for any build, new or old. Well worth the $$$.

Super High Quality Spring

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Spring quality is super good. Feels solid and does its job with improved longevity.

A great yet affordable upgrade

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Just got it in the mail and did a little shooting with it while alternating this spring with my Aero Precision rifle spring, and I am super happy with it, no more *twang! Noise when shooting which is so nice! I saw a lot of reviews elsewhere about this spring reducing some of the recoil and while I was very skeptical of that I can confirm that it does slightly reduce recoil on my rifle, which makes a already smooth shooting rifle that much smoother and aids getting on target a little faster. I am very happy with this order and it is well worth the money!

Super 42 Rifle Length Spring

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This is for Rifle length buffer tubes only. No Buffer is included. The braided spring has been used since WW2 in military arms. The Germans and Russians all use the braided springs in firearms. Now I have one for my AR MK 12/Mod 0.

Buttery Smooth

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I purchased three of these in conjunction with my Vltor A5 buffer system. It cycles really well. No complaints.

A good upgrade/option over standard single coil springs

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As a new AR assembler (having moved over from years of building AKs) I can say I honestly don't have a whole lot of trigger time. That said, this spring is substantially quieter than a traditional single coil rifle-length spring. To my untrained ear, after lightly oiling both and trying them at the range, this one is noticably quieter. If that kind of thing bothers people (loud springs) then this is a fantastic upgrade.
<br>Aside from that, Geissele has a legendary reputation so I have no reason to not think this spring will last me until the end of my days.