First off, make sure you have the correct buffer (carbine, rifle). I would highly recommend the David Tubb flat-wire recoil spring. We are running them in 3 different lowers and they are awesome. Also stops the "sproing" sound. Best $25 you'll ever spend on your AR : https://www.midwayusa.com/product/693755...-chrome-silicon
Also, which buttstock do you have?
Edited by Creedmoor (11/01/1602:48 PM) Edit Reason: I can't spell, lol
. There's a fine line between BRAVE ... and STUPID.