Tactical Springs (SPRINCO) BUFFER (ACTION) SPRINGS – AR15, AR10 and LR308

(38 customer reviews)





All of our springs are constructed from Certified Chrome Silicon wirestock to ISO 9001:2008 quality standards to withstand extreme heat and highly cyclic rate. The certification rating ensures a consistency in the parent material of 95%, which translates to repeatable consistency in performance & function. Certified Valve Quality Chrome Silicon wire is used in very high stress applications such as, NASCAR, Formula One, Moto GP & Pro Stock racing motor valve springs. It is not uncommon in some of these applications for valve springs to see 15,000,000 compression cycles in one race. It is this extraordinary capability that makes Chrome Silicon wire the obvious choice in our spring production vs. music wire or 17-7 PH used in OEM springs and by most aftermarket competitors. In addition, all of our Chrome Silicon buffer springs are heat treated, stress relieved, and dual-stage shot peened in separate post winding treatments. We also treat each spring with a proprietary, deep-penetrating, Re-Micronized (to .3 Micron particle size), inhibited, Molybdenum-Disulfide (MoS2) formulation to eliminate 90% of all mechanical wear on the spring. The combination of materials & processes result in a loss of no more than 5% in spring efficiency. The minimum anticipated duty cycles of our buffer spring designs are in excess of 1,500,000 cycles.



  • ASTM Grade A877 Certified Valve Quality Chrome Silicon Wirestock
  • Heat Treated, Stress Relieved and Dual Stage Shot-Peened post winding (Our springs really ARE shot-peened)
  • Impregnation / Plating with Re-Micronized Molybdenum Disulfide formulation
  • Hard plastic tube packaging for protected transport and easy storage
  • Optional Cryogenic Processing available upon request


  • Shortened “lock time” for faster sight recovery and platform stability

  • Consistent spring pressure throughout the duty cycle of the spring, resulting in fewer malfunctions related to spring operation. (Especially Type III malfunctions)

  • Improved & consistent cyclic operation. Spring will not change performance for many hundreds of thousands of rounds.

  • Greater resistance to heat induced performance degradation

  • Reduced cyclic rate with Enhanced or Extra Power springs and reduce / eliminate bolt bounce with optimal spring / buffer weight selection.

  • Reduced operating cost as replacement springs are not needed during the life of your upper receiver assembly. Less downtime and fewer trips to the armorer for spring replacement, in fact, this will most likely be the only buffer spring you will ever need for the duty cycle of your carbine or rifle!

  • Correct spring selection works reliably, consistently, and virtually indefinitely in all properly built and maintained AR platforms.


Standard AR15/M4 buffer springs (aka “action springs”) are wear items which must be replaced regularly in order for AR-15s to operate reliably, with conservative replacement taking place every 5000 rounds. Sprinco action springs in comparison, are over engineered and will last over 50,000 cycles.

Sprinco Chrome Silicon buffer springs are heat treated, stress relieved, and dual-stage shot peened in separate post winding treatments.  Sprinco also treats each spring with a proprietary, deep-penetrating, re-micronized (to .3 Micron particle size), inhibited, Molybdenum-Disulfide (MoS2) formulation to eliminate 90% of all mechanical wear on the spring:  this is why Sprinco springs do not produce the spring sound during shooting which is common with standard action springs.

Select from the following options:

  • RED: AR15 Extra Power Spring

The option with the most spring tension, this spring is suited for rifles and carbines with excessive bolt speeds. This spring is suitable for 14.5″/16″ uppers with carbine length gas systems (which are typically over gassed), all suppressed rifles, piston operated rifles, and 9mm conversions

  • BLUE: AR15 Medium “Enhanced” Power Spring

A slight increase in spring power makes this spring suited for rack grade weaponry with normal operation parameters. 16″ rifles with midlength gas systems, short barreled rifles with carbine length gas systems, etc.

  • WHITE: AR15 Standard “Regular” Power Spring

Equivalent spring power of a “fresh” AR15/M4 carbine action spring, this spring is for users who do not want to dabble with improving performance with extra power springs, but do not want to frequently replace their action springs as well

  • Red/White: AR15 “WHITE HOT” INTERMEDIATE Power Buffer Spring, Falls between the standard power (WHITE) and the enhanced power (BLUE) Color Coded WHITE / RED.


  • YELLOW:  AR15 Reduced Power Spring

Useful for undergassed rifles, such as some midlength gas rifles or “Dissipator” builds which is apparent with rifles that short stroke or have weak ejection patterns 

AR-15 Rifle / Fixed Stock Spring 

  • GREEN: AR15 Rifle Length Spring 

In addition to use in 5.56 Fixed Stock Rifles (A2 Stocks, Magpul PRS) the “Green Spring” is just the ticket for use in the VLTOR A-5 Stock System using their standard weight (5.2 Oz.) buffer for maximum versatility with almost any 5.56 upper barrel configuration, both with or without a “can” 

AR-10/SR-25 pattern rifles 

  • ORANGE: .308 Extra Power Carbine Spring (DPMS/SR-25 Pattern) 

The ONLY spring specifically engineered for .308 Carbine Platforms that use 7″ Depth M4 extension tubes and short 2.5″ Buffers (including aftermarket “heavy buffers”), this list includes:  Aero Precision, Matrix Arms, DPMS, Bushmaster (Post 2010), Remington, CMMG, Mega, SA Defense, Colt 901, Rock River Arms, and more

Additional information

Weight .5 lbs
Dimensions 12 × 2 × 2 in
Color Code:

, , , , , ,

38 reviews for Tactical Springs (SPRINCO) BUFFER (ACTION) SPRINGS – AR15, AR10 and LR308

  1. Ronald S M. (verified owner)

    Sprinco is best quality and recommend to get those spring instead of other brand. I got green spring.

  2. Patrick S. (verified owner)

    Blake is very helpful and answered every question I had. Spring is an upgrade to a mil spec and works as it should.

  3. Tri (verified owner)

    I appreciate the candor and the thoughtful advice. I ordered enough buffers and springs for all of my equipement. I also like the personal follow up to my order. I just wished he offered more products.

    • blake king (store manager)

      What products would you like to see in the future?

  4. Phillip (verified owner)

    Measured about 10 more pounds of pressure to hold bolt back vs normal spring. Just a basic non scientific measure but for anyway who wanted a comparison.

  5. Julian (verified owner)

    Sprinco white hot spring – the right choice for my 10.3″ Hanson barrel-
    B.K. had shipped this out to me fast, and had the best price around – I will be back again!

  6. Ken Ignacio (verified owner)

    High quality products. Plus good customers service. Highly recomended.

  7. John (verified owner)

    Should work fine

  8. Robert B. (verified owner)

    Exactly what I needed, in stock and shipped quickly. B. King is a 5 star vendor.

  9. Mervin (verified owner)

    Love it! Great spring for my AR pistol. It cycles smooth like butter! A must upgrade from standard spring for AR. They come in different color codes for different applications and B King’s Shipping was fast. Thanks B King’s!

  10. Anonymous (verified owner)

    Quick delivery, easy install, cycles like a dream, affordable. Handles near full auto cyclic rates with no problems at all. Delighted with it.

  11. Colin (verified owner)

    I did not know anything about this site or company. Placed my first order and it was nothing but a perfect experience. Fast shipping and a tracking number emailed to be. The products were just what I asked for and looked high quality to boot. Will buy from you all again with no hesitation.

  12. Lance (verified owner)

    Great for the pistol build

  13. Michael R. (verified owner)

    Upgraded my BCA 450 Bushmaster, helped lessen recoil and enhanced cycling.

  14. Ian (verified owner)

    Outstanding springs that work for the lifetime of your firearm. Several spring powers available to get your buffer system running just so. BKF has them for just $20

  15. mberet (verified owner)

    308 runs like a champ no issues

  16. Miguel (verified owner)

    Did the job done

  17. James Budge (verified owner)

    Spring worked perfectly. Great price and attentive customer service. I’ll do business with BKFirearms again.

  18. Andrew L. (verified owner)

  19. Sean (verified owner)

  20. Jason Brown (verified owner)

    Shipping was fast and the spring was as advertised, great transaction and product. Thank you

  21. troy Hudson (verified owner)

    Alan’s springs are referenced for use by virtually everyone. It’s not by accident.

  22. Damian T. (verified owner)

    First, the shipping was very fast all the way to California while dealing with Coronavirus.
    Second, the springs are a great improvement to the rifles.

  23. Stephen o. (verified owner)

    Amazing quality, fast shipping. Friendly customer service.

  24. Kalman K (verified owner)

  25. Timothy B. (verified owner)

    Springco springs are great. Awesome customer service and quick shipping. Will continue to buy from BKings.

  26. kenneth oger (verified owner)


  27. Charles H. (verified owner)

    Fast service, order was correct. CS answered my questions on which springs I needed before I made the order.

  28. Joshua Blair (verified owner)

  29. Albert (verified owner)

  30. James Sevick (verified owner)

  31. Gabriel LeBoeuf (verified owner)

    Ordered 2, only received 1, contacted customer service, second one showed up in just a couple of days. Extremely impressed, highly recommend!

  32. Franklin (verified owner)

    good reviews , wanted upgrade for new build

  33. Wesley Pinkston (verified owner)

  34. Ryan (verified owner)

    Props to bkings for having it in stock! Spring does what it’s supposed to.

  35. Thomas U. (verified owner)

    Great springs, go with the red one for 9mm PCC.

  36. David (verified owner)

  37. Ryan (verified owner)

    Still waiting on my 80% lower sooooooo! Lol! I love your services!!!!

  38. Will Patriot (verified owner)

    GREAT Company & GREAT Products!

Only logged in customers who have purchased this product may leave a review.