Great upper - Primary Weapons Systems MK116 PRO 16 inch Upper Receiver

It works flawlessly right out of the box. Attached it to my lower I built on my own. Good length and balance. I added some attachments. I added a M-LOK QD Swivel mounts so i can use 2 Point Rifle Sling, Magpul backup sights, and the Burris TAC30 which is a close quarter tactical optics kit. It looks great with the upper.

Fired approximately 200 rounds at the range last weekend. Very accurate. I was able to get tight groups at 50 and 100 yards after zeroing it in. I like the matte finish. Recoil is good and very manageable. The Radian Raptor LT Ambi Charging Handle is very smooth. I have not gotten a chance to use the adjustable gas regulator. I also bought a PWS Compensator since flash hider is not allowed in California...

This was my first rifle build and i am very happy with how the upper performs. I highly recommend it for those who want to build an affordable and accurate rifle.