Here's my last two AR builds.
The shorter one is a M4 clone I built last year with a 14.5" barrel and a 2" flash hider spot welded on to keep it legal. I built it for my wife so I am keeping it pretty light weight for her. The hand guard is a MI SS Gen-2 7" free float tube with a Magpul AFG2 grip on the bottom. I had to machine two of the add-on rails so they could overlap at the middle to share a mounting hole to make a rail long enough to properly mount the AFG2. The rear sight is a standard Magpul Mbus. Internally the trigger, disconnector and hammer have been updated with silver ND3 coated parts from WMD Guns. The (supposedly) Mil-Spec parts in the LPK that came with it were giving me lots of trouble and the company I bought the kit from wasn't honoring their warranty, so that's why they got swapped out. I used KNS anti rotation pins for the trigger and hammer as I've had issues with those pins falling out on some of my builds before and figured I keep it from ever happening on this one with the new pins. I'm still waiting for a high rise Bushnell TRS-25 red dot sight I ordered to show up, but it's presently on backorder. Haven't decided on a sling for it yet and I'm open to any recommendations.
The longer one is my most recent build with most of the parts coming from Palmetto State Armory. The lower is a $59 blem picto type, but it looked damn near perfect when I got it. The LPK is a $49 PTAC AR15 MOE kit and I have some KNS anti rotation pins on order for this rifle as well. The upper assembly is a 16" heavy profile carbine barrel with a 1:9 twist and is Melonite coated with the BCG and charging handle included for $399. The hand guard is the same MI SS Gen-2 as the one on the shorter AR except that this one is 12.5" and completely covers a low profile GB. The forward grip is the original slightly bigger Magpul AFG1 and is mounted on two of the add-on rail sections. The forward rail section has a quick release sling mount hole just ahead of the AFG1. The rear sight is a plastic Magpul MBUS and the front sight is a Magpul steel MBUS Pro. The rear steel Magpul MBUS Pro was out of stock so until they get back in stock I'll just keep using the plastic one for now. The optic is an Aimpoint PRO and I got it for $399, which included the rear plastic Magpul MBUS I'm temporarily using, for that price. The current stock is a spare Mil-Spec M4 6-position stock I had lying around from an older AR build. I'm still waiting for the Magpul UBR stock to arrive before I can call this one done. I need a sling for this one as well and I'll be using the quick release swivel mounts for whatever type of sling I get. Also open to suggestions for a decent sling on this one as well.
This $289 upper is waiting in the wings for my $49 Anderson lowers and $29 LPKs (both from PSA) to show up. I'll use the M4 stock off the longer AR in the pic above to finish it off after the UBR stock arrives and is installed. I also have a ProMag rear flip up sight that I'll be using on it to save a a couple of bucks there as well. It's looking like this one will end up being a standard 5.56 M4 AR built for $367 with using the extra spare parts I have on hand.