Yeah I can understand that. Nothing wrong with the M145. Just kind of ugly IMO and I am sure the reticle on the ACOG is nicer. However for the range... sure it would be good. Of course irons are too.
I am using the H3 buffer it comes with. Do you have any link issues with them jamming. What Hydraulic buffer are you using?
I had link issues when I got my first 1. Sent it back and they swapped out the feedtray . I use a Endine buffer on both but I see the KYNTEC looks to be identical to it ( Brownells sells them) Went from 3-4 rd burst walking off target. to putting all the shots in a 6 to 8 inch circle at 100 yards in full auto. Makes a huge difference and drops the cycle rate about 150 to 200 rds a min slower . I haven't had a feed issue on the newer upper as bad as the old 1. Added the buffer on the new 1 and no more feed or hammer following issues with the new upper. Had the H3 buffer in the new 1 at first. then switched it out.