I have installed these springs on all but two of my builds - Strike Industries AR Carbine Flat Wire Spring

I have installed these springs on all but two of the builds I have put together, one of the builds has a captured spring from another manufacturer and the other build was for a guy who wanted an inexpensive rifle. The guy bought his own upper, lower and BCG, a bunch of us guys who shoot together donated left over parts to finish the rifle, one of the guys donated a blemish barrel that shoots really well (I installed a mil-spec. trigger that I had polished and had in one of my rifles before I installed a two stage), looks like a budget mil-spec. AR and has that distinctive scrape/twang of an AR when charging, (the guy was shooting smaller than quarter size holes @ 50 yards with BUIS, thing is a real sleeper). Now, on to the Strike Industries recoil spring. I have shot several different rifles with everything from mil spec. to fancy, expensive hardware, BCG, springs, trigger groups, barrels, etc. Unless you have a suppressed rifle I can’t tell the difference in sound from one another as far as “twang”. These SI springs do have a distinct sound when charging the rifle, but nothing bad as far as I can tell. If you are having difficulty installing this spring, use a small flat piece of plastic or a cleaning pick to hold down the buffer retainer as you install the spring. The main reason I chose these springs over mil-spec. round wire is longevity and spring tension consistency. With these flat wire springs combined with an adjustable gas block and light weight buffer, I have tuned my rifles to be softer shooting and I have obtained a balance of reliability with the bullet weights that I shoot in my rifles. If you really need your buffer springs to be quiet, find a high quality dry lubricant (not graphite, also recommend not to use oil or grease due to being dust and dirt magnets) for your buffer tube and that will make a big difference in the scraping/twanging sound that these rifles are notorious for having. Happy shooting and keep it in the black.