Some folks seem to get hung up on a .22 LR rifle looking tactical and seem to think that someone buying one, such as an M&P15-22, could have gotten a better deal purchasing a $150 22 LR semi-auto.
I bought a M&P15-22 for a couple of reasons.
#1....I wanted a rifle that I could practice with on the cheap but still gave me the manual of arms as an AR-15. I'm sorry but a Marlin or such doesn't come close, even when you tie wrap a rail to it and hang a laser from it.
#2....I wanted a rifle that would easily adapt to two young grandsons...one they could start out with young and simply adjust the LOP as they grew into the rifle. At the same time, Grandpa could grab it, adjust the stock, show them something, hand it back, and they could readjust it for their size in just a couple of seconds.
#3....S&W stands behind their products quite well, IMO. I got one of the early models that did have an extractor issue.....one phone call....got a call tag to send it back....they fixed it, tossed in a 25 round mag for my trouble and sent it back, all on their nickle. No questions asked.
#4....I didn't want a .22LR upper or a .22LR conversion kit for my regular M&P15. Once again....to the range I go with the grandsons....Grandpa shoots his M&P15 while the boy do the M&P15-22. Hard to do that with one receiver.
#5....The M&P15-22 takes an AR-15 trigger if so desired. You want the same trigger on both rifles? Buy another and install it.
The weight difference doesn't bother me at all. About three rounds into the 25 round mag and that is the last thing on my mind.
The M&P15-22 is not a tack driver....but I didn't buy it for that. If my grandsons need to drive tacks, they can use my Savage 10 FCP when they get big enough to carry it to the firing line.