Not really an upper but thought it fit here...

I just got the new S&W dedicated .22. It's a polymer based AR-15 in .22 only.

Initial impressions:
Positives:
AR fire controls
Working Bolt catch/release -- means actually practicing mag changes the right way...
Works with Mil spec Stocks/grips
Has quad rail free float fore-end
$499 price tag, Spike's dedicated uppers run $549

Negatives:
One piece lower (with "buffer" tube) doesn't allow for single point sling mounts.
Magpul MIAD grip reacquires A10 grip wedge.
Mags do drop free, but you have to watch the first round in the mag and make sure it's not pointed down.
Mags are also a little longer than AR mags

Mags:
It takes S&W preparatory magazines I ordered an extra 3 for $21 ea here

Final Thoughts:
I found this thing to be very accurate, but I really enjoy the things like fire control and bolt catch/release that allow great training analog over a dedicated upper. I've shot over 500 rounds through this thing already and can report that this thing runs like a top on all kinds of .22. I used a few mags of CCI mini mag, but moved on to a brick of Winchester. I'm very pleased and as you've probably noticed I recommend this great .22 AR to anyone looking for a plinking gun, or training analog.

here she is:


As a side note, I have owned a dedicated spikes upper, and a CMMG .22 kit. Been more than happy with both. I've also had some time in a store with the "Colt" (Built by Umarex) and it's nice but has somethings like the 180 degree (full auto position only) safety; and a non working bolt catch/release. As well as non compatibility with some AR accessories.