Good enough wasn't good enough, so we're 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 now fits over all buffer styles with no interference.
Round wire springs have 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 bolt lock time time to increase slightly which drops chamber pressures before extraction. It also helps to push the bolt back into battery through adverse conditions and fouling, helps to strip stubborn rounds out of magazines, and can even help reduce bolt bounce. 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.
Spring Load in a Carbine Length Buffer Tube:
Bolt Forward in Battery:
Bexar FWS ~ 7.5 lbs
Mil-Spec ~ 6 - 6.5 lbs
Bolt Locked to Rear:
Bexar FWS ~ 12 lbs
Mil-Spec ~ 12 - 12.5 lbs
Bring your AR into the 21st century with a Bexar Arms Enhanced Flat Wire Recoil Spring!
The Gen 2 AR-15 Flat Wire Spring is designed and optimized for use in Carbine Length buffer tubes. If you're running an A5 or Rifle Length buffer system, please use our A5/Rifle Spring Spacer in conjunction with our Gen 2 FWS.
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. You'll know if you've used enough when you drop the bolt on an empty chamber and the twang is gone!
- Gen 2 AR-15/M6 Enhanced Flat Wire Buffer Spring
- Optimized for Carbine Length Buffer Tubes
- 17-7 PH Stainless Steel Construction
- Improved Spring Load Characteristics
- Reduces Bolt Bounce
- Reduces Spring Rattle
- Lifetime Warranty
- Weighs 2 oz
- 100% Made in the USA
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
- 9mm PCC straight blowbacks
DO NOT use with the following:
- Receiver Extensions shorter than Carbine Length
- AR-10/SR25 or any Large Frame AR's
- .308 Win/7.62x51 NATO
- 6.5 Creedmoor
- .260 Remington
- .243 Winchester
21 Reviews Hide Reviews Show Reviews
I have Bexar flat wire springs on most of my AR-15 builds and love them. They function incredibly well on my suppressed SBRs and standard length rifles alike.
Great product, showed up faster then expected, install was a breeze. Even came with some cute stickers!
Outstanding performance..highly recommend this spring!
This spring is arguably one of the best bang for you buck upgrades you can do for a traditional carbine length buffer assembly
Outstanding product at a great price
The best thing about these things for me is the increased load at full extension - even if I'm riding the charging handle the whole way, these things have enough oomph that I've noticed my habit of thumbing the BCG scallop has become entirely pointless. That extra little push at the end seems to help with chambering steel cased rounds after lacquer starts building up too. Only real "disadvantage" these have over cylindrical coil springs is that they squeak noticeably more because of the flat outsides of the springs - but that goes away with a smudge of grease down the length of the spring.
You definitely can feel the difference with this buffer spring, It has more pressure on the bolt but operates the same as a mill spec on recoil, definitely recommend it.
Flat is Justice UwU
This recoil spring will last longer than a round wire spring due to not getting as fully compressed when the bolt travels rearward. For the price, it makes your rifle feel way smoother and nicer.
Excellent product and service. Repeat customer that will be coming back many more times!
Spring is somewhat quieter. Stiffness is good at compression. It is tricky to get it it in the buffer tube. More so if you have a binary trigger group like mine.
I just ordered my second one for a build I'm working on. As others have said, installation is a bit of pain compared to conventional round wire springs, but well worth it. The action is immediately and noticeably smoother. That was what surprised me. I just wanted to get of that annoying twaaaang, but the feel is also just smoother. The gradual springy sensation as you charge the weapon is virtually gone. Seemed a hair strong at first, but after a little while of playing with it through a bunch of compressions and decompressions it settled in nice. Definitely recommended. Ya kinda can't go back after running one of these.