Sprinco M4 Blue Enhanced Power Buffer Spring
- For carbine length buffer tubes and mid-length gas systems
- Color coded blue
- Enhanced power
- Made from chrome silicon wire stock
- Heat treated and shot peened
This recoil spring is color coded blue indicating that it is optimal for use with 5.56 AR-15s with a mid-length gas system and carbine buffer tube. Sprinco has extensively tested this setup and have concluded that it works great with 5.56 AR-15’s with a barrel length from 12.5” to 16” and either a standard or H2 buffer weight. It also helps you to easily identify which power spring you have in your AR-15 if you have a habit of changing your setup constantly.
Ratings & Reviews
by Kyle -
Great product, nice fit and finish as described. I purchased this for a 10.3" pistol to combine with a H2 buffer. Primary Arms shipped my order the same day I ordered it and I couldn't be happier with my purchase.
Great for smoothing out recoil.
by Paul -
Ordered this spring for my Psa middie along with an h2 buffer and now it feels like a dream, so smooth! Would buy again.
Smooth and the Price is Right
by Brandon -
Primary Arms always has fast shipping and gets to me in 2 days. The buffer spring at first was stiff which is to be expected. After 500 rounds it has worked flawlessly. I put it in my new 14.5 mid-length pinned and welded with h2 and did not have a hiccup. Don't recall hearing the twang sound you normally do with regular buffer springs. Was getting around 3 o'clock ejection with 5.56 on a possibly slightly over gassed rifle. Now I need to get one for my 11.5 BCM pistol. Price is right as well and this is a minor upgrade that will go a long way.
This should be standard in all AR’s!!
by Damon -
My CMMG Banshee 45ACP felt like the bolt was getting beat pretty hard. More recoil than it should be having. Added this spring and a H2 buffer here from Primary and my precious Banshee shoots butter smooth now. I always replace any AR buffer spring with a chrome silicone spring. My first one from Sprinco and it works flawless.
Nice product, great with the adjustable buffer.
by Mike D -
Currently running this in an AR15, 10.5 inch carbine, along with an Odin Works adjustable buffer, at 6.65oz, extra heavy. Everything is running fine, but the brass is still kicking out at the 2 to 3 position. Therefore, thinking about the Red spring, ultimately getting the brass towards the 4 position.
High Quality Buffer Spring
Sprinco blue spring arrived in a hard plastic tube with an instructional insert. Per instructions, I lightly lubed the spring, inserted and properly seated the Aero 4oz buffer i have, and ran it.
<br>On a Ruger Ar556 with carbine length gas and 16.1inch barrel (slightly overgassed), this set up ran PMC 223 and Winchester/PPU 556 without any issue. Ejected regularly at 3 o'clock with zero extraction issues.
<br>With a standard H2 buffer, the felt recoil would be even less, but i opted for the 4oz, standard M4 loadout. With a good muzzle brake and this buffer/spring combo, the rifle is very, very easy to manage and keep steady.
<br>Lastly, the spring is coated with Molybdenum Disulfate which reduces the "BOINGGG" noise to the point you wont even hear it anymore.
<br>Overall, a high quality product. Would recommend to any AR owner.