I bought what I thought was a Spikes AR-15 back around 2011 during the Frankenstein legislation scare. Was a novice to ARs other than cleaning and shooting a lot of rounds through one in 1975 back in the Corps. Did way too little research in my tantrum fit and was thoroughly embarrassed at what I spent and what arrived in the mail. Only thing that was Spikes was the lower. Long story short a decade goes buy and that thing stays in the back of the safe out of sight I'm so pi$$ed about it. Finally decided to make it mine with an upgrade to something more closely resembling what I thought I was buying off Gunbroker. Wanted to remove a bulky drop-in handguard, which required removing a railed gas-block as well and replace with a free float STNGR and change out trigger, etc. Got the parts all in before beginning the tear-down only to find once I started that there was no way that barrel nut was budging with an armorers wrench - not with heat, not with all my weight on it, not with a hammer, nada! After breaking some of the teeth off the barrel nut I finally had to get the dremmal-tool-of-death out just like any good bubba would do and cut the Delta Ring in half just to get a pipe wrench on the barrel nut. Someone forgot the anti-seize grease and then put a gorilla torque on that thing. All is good now but when I see recommendation for anti-seize grease in the future I'm gonna take that recommendation seriously.