AR-15 Enhanced Flat Wire Recoil Spring

MSRP: $26.99
Our Price: $17.99
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(24 reviews) Write a Review
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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 places more load on the bolt when it is in battery. This equals slightly increased dwell time and lower bolt velocity. When the bolt is locked open, our 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!

Our Flat Wire Recoil Springs may be a tight fit over the shoulder of your buffer. This is completely normal, and it is not necessary for your to force the spring onto the shoulder. Simply install the spring and buffer as is, and after a few shots, the spring will seat itself on the buffer shoulder. Our Flat Wire Recoil Springs are only compatible with Mil-Spec style buffers with slim shanks and pronounced shoulders. Buffers with straight shanks and no shoulder, or a minimal amount of shoulder do not have enough clearance to function correctly with our Flat Wire Recoil Springs. 

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!


  • Enhanced Flat Wire Buffer Spring
  • Optimized for Carbine length receiver extensions (including some Pistol buffer tubes)
  • Compatible with VLTOR A5 and Rifle Length 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
  • Eliminates Bolt Bounce
  • Reduces 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.

24 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Pointyhead on Sep 22nd 2020

    Everything that this spring claims to do is spot on. Running one in my 5.56 and a 300AAC and the twang is completely gone. Now the ejection pattern is in a nice neat pile, unlike before this install. Every build moving forward gets another one of these springs.

  • 5
    Flat Wire Spring

    Posted by Ted Carlson on Sep 20th 2020

    Awesome spring, replaced my carbine spring and I haven't had anymore issues with my bolt going into battery. The greased spring is also incredibly quiet, no more twang.

  • 5
    Flat Is Justice

    Posted by Matthew Nelson on Sep 18th 2020

    Awesome buffer spring. Greatly reduced felt recoil and has my AR running smooooooth.

  • 5
    Good spring

    Posted by R.G. on Sep 1st 2020

    Spring works great. I don't really care about noise, but it is noticeably quieter. ID on the spring is slightly undersized so it can be a pain to assemble. Great spring for the money.

  • 5
    Bexar Arms Flatwire Spring

    Posted by Greg on Aug 27th 2020

    Spring works great, no sound even without grease. Used in a pistol build with SBA4. I cannot recommend the seller enough, Phillip is a pleasure to work with and goes above and beyond to ensure his customers are satisfied.

  • 5
    Bexar Flat Wire Recoil Spring

    Posted by Unknown on Aug 10th 2020

    I bought one of these a while ago and finally got out to the range with it. It's much quieter and smoother than my original recoil spring, and even slightly reduced felt recoil. Good purchase.

  • 5
    Flatwire spring

    Posted by Hingle McKringleberry on Aug 9th 2020

    This spring instantly makes your AR feel so much nicer when you rack the bolt. There's an obvious difference in recoil for the better over a standard carbine spring and once you add some grease, per Phillip's recommendation, it'll feel like magic elves are working inside your buffer tube. I see now that people online hype this spring for darn good reason!

  • 5
    Smooth and Quiet

    Posted by Jason on Aug 5th 2020

    Truth be told, haven't had the chance to shoot with it yet, but simply charging the rifle feels smoother and is noticeably less clangy and noisy. Very happy with my purchase!

  • 5
    AR-15 Flat Wire Spring

    Posted by Tom on Aug 4th 2020

    I got two, one for a new build and one for my existing .300 blkout pistol. Even without greasing the spring it has made my pistol have more manageable recoil and has reduced the "sproing" sound that was especially prevalent when shooting subs.