Awesome all in one kit! - Angstadt Arms AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring, 9mm Buffer Spacer

I bought this kit because it included everything for an AR9 build. Each piece has a very nice finish to it and has proven to be very durable and reliable. I have this set behind a 16" overall length barrel (14.25 w/o flash hider) and I have fired ammo from factory charge defensive ammo down to hand loaded, low charge target rounds and have had absolutely no cycling issues. There is no hard recoil with the factory charges and no evidence of wanting to short cycle with the low velocity (<900fps) target ammo. All in all a very nice kit for an AR9 carbine.