So does this mean your niece is shooting her boyfriend ??
After seeing her shoot the AR and SKS ....... he is safe ..... LOL. My brother-in-law came with them and sighted in his Remington Pump .270 @ 100 yards. He is good to go for next Saturday, opening day for deer.
Zack, my nieces boyfriend could not get his High $$ AR on paper. He has a Mag Pul rear sight on the rear rail and standard post in the front. I had him move up to 10 yards and he was WAYYYYYY LOW. He adjusted the rear as far as it would go, so he said, and still was 8" low. He said he guessed he was going to have to get either a red dot or other optic for it. Well for one thing he didnt know how to adjust the sights at all. He was flipping the double apature to the lowest one and thought that was it. showed him the screw on the side marked "UP and DOWN" ..

After that he was moving it a couple clicks at a time and the groups were barley moving. I said in my best Old Gunny voice .....GIVE ME THAT THING .... Cranked on a Whole bunch of clicks and it then shot about 1.5" low. At this time we were at 25 yards and explained to him about trajectory and click values. Another 12 clicks and it was MAXED OUT. Groups still about .75" low. Now i says time to adjust the front Post. Again he was clueless about it. showed him how to do that and with 5 clinks down on the post he was OK.
His SKS had the same problem. It has the sliding ladder leaf sight adjustable ..... so it says...100 to 500 I think. Again the front post is just a big screw. Now he knows it is just like the AR. Move the front post DOWN to bring the groups up. I liked it better than the AR. We shot up about 200 rounds thru the 3 rifles. He left happy with groups Minute of anything offhand 50-100 yards.