I purchased my M&P-15 Sport II in 2018. Love it. Added a Bushnell TR-25 RD (replaced It with a Sig Romeo5), 3x Multiplier, Magpul hand guard, Bravo Co. stock, QD & sling, Magpul rear iron sight. I have put hundreds of rnds through it over the years and it has given very few problems. It has been a very reliable weapon. I still don't understand why people spend $2000 or more on DDs OR LMTs. I guess it is a desire to be an "operator", be tacticool or have the latest greatest. Unless one is in SF, SWAT , etc, why? If you think that you are going to engage someone at 100 yds, then you will have severe legal problems.
My poor, humble M&P-15 Sport II keeps on putting rounds on target. I keep reminding myself that Kyle Rittenhouse successfully defended himself with the same weapon.