Dollar for dollar they cant be beat - Aero Precision M4E1 AR-15 10.5in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider

So for many years now, it’s been a hobby of mine building AR’s and I started off with Aero Precision and I have some now that have Thousands of round down range and run like the day I built it drop in trigger decent buffer good bolt carrier weather it’s a 5.56 or
300blk or even their M5 platforms dollar for dollar they can’t be beat, it’s not by no means a BCM or Daniel defense but with the right internals, it can hang with them their uppers and lowers fit so nice and tight and you have that adjustment screw of the bottle to make it even tighter which a lot of other companies lack so if you’re looking for a decent platform to start off with you can’t go wrong with Aero precision