Great 22LR Dedicated Upper!
You will really enjoy that dedicated 22LR upper and with ear protection all you hear is the bolt opening and closing. I bought mine about 6 months ago from Palmetto State Armory. I have had more fun with this accurate 22LR upper than my 223/5.56 uppers. Currently I have a cheap 4X 1" scope on it designed for 50 yard shots. I originally had a cheap red dot sight on it that was alot of fun also. The twist is I think 1:16 that will stabilize 22LR rounds rather than 1:7 or 1:9 designed for 45 to 62 or greater bullets. Besides it is cheap to shoot.
Have fun: Lemmon