I used quotes because it is perceived quality. The delton uppers will usually be CMV while PSA chrome lined, 1:7 twist vs 1:9, lead-lapped so when you get it the upper is GTG, no break in period, it's not much of a difference but it is what it is. If you plan on using heavier grain bullets than a 55gr maybe grab the 1:7, also Chrome lined will last longer. Increased life of the barrel = more bang for you buck. For your Delton upper you will have to pay $45 more for your upper to be chrome lined making the PSA upper cheaper than the delton. Also PSA has great customer service and custom builds the upper for you. No handguards, no BCG, no flash hider? everything is configurable. If you plan on putting on the zombie killer dust cover and don't want to have an extra laying around ask them to leave it off. They will quote you how much without those items. No unnecessary items laying around that you purchased and won't use.