JP Tuned and Polished Extra Power Large Frame Carbine Buffer Spring

Manufactured by JP Enterprises
Manufactured by JP Enterprises
8 Reviews

In Stock

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Precision centerless ground and polished operating springs offer a smoother and quieter operation in AR buffer tubes. Improved impulse feel results in faster sight recovery and improved reliability. Recommended for large frame AR pattern rifles using Carbine buffers as well as 9mm Carbines.
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BrandJP Enterprises
MaterialSteel - A401 Chrome Silicon Wirestock
TypeAction Spring - Carbine Length - Extra Power
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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JP Tuned and polished buffer spring


As can be expected, Primary Arms has the best price 95% of the time and fast / reasonable shipping. My go to source.

beefy spring


don't have all the parts yet for my 308 build, but this spring is beefier than the others out there. can't wait to try it.



I use my guns for work and I recently did a high end AR build. This product was brand new and I purchased through Geissele. These guys have never made a crappy product. They took the AR buffer and spring to the next level. Immediate and noticeable recoil reduction smoother cycling weapon and the gun is 100% steadier on full auto. I promise you it will be the best $60 you ever spent on a gun part.

Stick with 308 build not 9mm

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Purchased for a 9mm build, coupled with a 6.5oz extra long buffer. Too much. I'd advise using a lighter buffer with this or a standard spring with a heavy buffer. Otherwise you run the risk of short strokes and burst shots.


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I installed in a Colt AR9 with Spike ST9 buffer. Runs flawless and functions excellent. High quality.

Used for a .450 build

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Used this spring and a Guntec AR 9 buffer in my .450 Bushmaster carbine build. Rifle cycles fine with Hornady Black ammo. Casings eject 90 degrees about 3-4 feet. Bolt stays open after last shot.

Works great

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Combined this spring with a heavy(5.3 oz) buffer and worked perfect.

Great Spring

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These are a great spring and get rid of that nasty twang sound. Smooth running.