Added a holosun 403B red dot to this package and I'm really digging it. I should have jumped on the 10.5" upper bandwagon long ago!
Accuracy has proven to be more than acceptable for this type of gun and my uses. I've now got a few hundred rounds through it without a single hiccup, minus the couple FTF's in the first 10 rounds or so. Overgassing has proven to be a non issue. Runs suppressed and unsuppressed without issue, standard weight buffer and bcg.
I suppose my only "gripe" would be the lack of mlok near the end of the mk13 rail. I knew this going in and now see why the mk13 was probably put on these budget uppers vs something like the mk4 or mk8. It's not a bad thing, necessarily, to have pic rails at the 3, 6, and 9 o'clock positions but as we all know it doesn't provide the lowest profile mounting solution for lights, lasers, and such. I use this gun with my NV so at some point an illuminator will probably be mounted at 3 o'clock. For now my helmet mounted IR illumination does ok and keeps the gun lighter. I run an OTAL at 12 o'clock behind the front buis and and a tape switch at 10:30.
Really quite impressed with the quality of this upper for the price.