AR-15/M16 Enhanced Flat Wire Recoil Spring - Gen 2

MSRP: $26.99
Our Price: $23.99
(You save $3.00 )
(3 reviews) Write a Review
Usually ships in 1-2 business days.
Adding to cart… The item has been added

Good enough wasn't good enough, so I'm proud to introduce the Gen 2 AR-15/M16 Flat Wire Recoil Spring! Most notably, if you're familiar with the original FWS, the Gen 2 FWS fits over buffers much better now!

Round wire springs has been the standard since the inception of the AR-15 in the 1950's. Compared to round wire springs made of music wire, stainless steel, or even chrome silicon, our Enhanced Flat Wire Spring does numerous things better than its round wire counterparts. Our Flat Wire Spring places more load on the bolt when it is in battery which causes dwell time to increase slightly which drops chamber pressures before extraction and reduces rearward BCG velocity. When the bolt is locked open, our Gen 2 Enhanced Flat Wire Spring places the same amount of force on the bolt as traditional round wire springs.

Why does this matter you may ask? Our Enhanced Flat Wire Spring acts like an extra-power round wire spring, yet cycles as easily as a standard buffer spring. The higher preload and lower compressed load also means recoil is smoothed out and bolt bounce is typically eliminated, even when running ultra-lightweight buffers. That annoying spring rattle or "twang" sound is greatly reduced or eliminated, too.

Bring your AR into the 21st century with a Bexar Arms Enhanced Flat Wire Recoil Spring!

100% Made in the USA

A note from Phillip: If your spring still has some rattle or twang once installed, try using some of your favorite automotive grease on the buffer and spring. I personally prefer the full synthetic Lucas X-TRA Heavy Duty "green" type of grease. Your spring should now be completely twang free!


  • Gen 2 AR-15/M6 Enhanced Flat Wire Buffer Spring
  • Compatible with Rifle, Vltor A5, Carbine, and carbine length Pistol receiver extensions
  • Stress Relieved 17-7 PH Stainless Steel construction
  • Increased spring load on a closed bolt
  • Standard spring load on an open bolt
  • Improved harmonics smooths cycling and recoil impulse
  • Reduces/Eliminates Bolt Bounce
  • Reduces/Eliminates that annoying AR "twang" or spring rattle
  • Lifetime Warranty against damage or failure!
  • Weighs 2 oz
  • 100% Made in the USA

Recommended Uses:

Use our AR-15 Enhanced Flat Wire Buffer Spring on any gas operated small frame AR calibers such as:

  • .223 Rem/5.56 NATO
  • 6mm ARC
  • 22 Nosler
  • .224 Valkyrie
  • 300 Blackout
  • 6.5 Grendel
  • 6.8 SPC
  • 7.62x39
  • 9mm PCC straight blowbacks
  • etc.

Not recommended for use with:

  • Receiver Extensions shorter than Carbine Length
  • .308 Win/7.62x51 NATO
  • 6.5 Creedmoor
  • .260 Remington
  • .243 Winchester
  • etc.
While buffer springs are normally a wear item that are replaced in regular service intervals, we are so confident that our Enhanced Flat Wire Springs will never be shot out or damaged from normal shooting that we guarantee it for life! Should you somehow manage to make our Enhanced Flat Wire Buffer Spring fail to do its job, contact us and we will send you a replacement free of charge! Should you try our Flat Wire Spring and decide it's not for you, please contact us for a full refund! We will refund you the cost of the spring, the original shipping charge, AND send you a free return label. Warranty does not apply to any springs that are permanently modified to be used in receiver extensions that are shorter than Carbine Length Buffer Tubes.

3 Reviews Hide Reviews Show Reviews

  • 5
    First Upgrade You Should Make!

    Posted by Mika Howser on Feb 24th 2021

    This flat wire is awesome. I have both a captured spring and 2 of these flat springs. When shooting the two rifles suppressed both devices do an excellent job of getting rid of the “twang!”. The flat spring is a bargain for what it does. Every build I do going forward will have one of these. A must have in my books!

  • 5

    Posted by John on Jan 18th 2021

    I purchased 2 of these flat wire springs. One for my Springfield Saint and one for my 11.5” pistol build. These things are pretty sweet. No more twang. Installation was a little more difficult than the Mil-Spec ones I had. It’s because of the flat edge. No big deal though, I used a little grease and just screwed the spring into the buffer tube. I would highly recommend this spring. It has to be one of the cheaper and easier upgrades one can make to an AR. Service was quick and it even came with a hand written thank you note. They have definitely earned more of my business.

  • 5
    Great flat wire!

    Posted by Andrew W on Jan 4th 2021

    I'm very pleased with the performance of this new buffer spring! It fits my buffer perfectly and feels great to shoot. Plus, it shipped quickly and customer service has always been 10/10 with Bexar.