So far ok basic 16" 7.62x39mm ar-15 complete upper receiver - TRYBE Defense AR-15 16in 7.62x39mm M-LOK Complete Upper Receiver

First, let me say I was skeptical about ordering this since I know nothing about TRYBE Defense. But I took the plunge based on price and reviews. So far this seems to be an OK basic 16" 7.62x39mm AR-15 Upper. I still don't know who actually makes these for TRYBE Defense but I do know that the entire upper is very similar to the upper on my 16" Radical Firearms 7.62x39mm AR-15 Rifle (SKU RF01631). In fact, in a side-by-side comparison of the 2 uppers, the handguards are identical except my Radical has a better finish (TRYBE is basic flat matte). I mark this upper as 3 stars because of the finish and also because I can't find any markings on the barrel or anywhere on the upper indicating the caliber...kind of scary. As a result, for safety reasons, I felt compelled to spend a few extra bucks to order and install a YHM 7.62x39 Caliber Marked Dust Cover.