i found that home builds generally do better than factory.
yet then again i am running ones i built! LOL!
i really like the cav-arms polymer lowers! if i build another lower this year for myself that is what i am going to run most likely. mall ninjas-hat the cav-arms for some reason.
i guess if colt made them they would change their tune.
i have run my cav lower on a 5.45x39 conversion upper. lost count of the rounds. haven't had any problems to speak of with it. it just keeps on ticking!
nice build! and it proves you don't have to blow a wad of dough to build a good running ar-15!