I use these in all my AR platform's

Just finished my skeletonized build & chose the Armaspec SRS because it’s a better system than spring & weight & it’s a drop in part plus best of all it’s much cheaper than JP! Only have a few mags through it but the difference is noticeable. If your on the fence just jump off & buy one!

To install, take apart your rifle and just press down the retainer pin to take out your original buffer spring. Pop in the new one (if the hammer gets in the way, press it down a little) and done. I noticed about a 30-40% reduction in recoil and the action ran smoother than before. Also, it's much quieter. I bought this H1 spring for my AR with a 16 in barrel. The retainer is not included but wasn't needed in my rifle anyway. I'd recommend this to anyone looking to reduce fatigue from recoil after firing all day.

I started using this spring on builds a couple of builds ago. I like the cushion it provides. Recoil is gently dissipated for a smoother action and the annoying "twang" of the mil spec buffer spring is gone. It is IMO an improvement over mil spec. And you don't need to install the buffer spring retainer, although you can if you wish.