I saw this issue being discussed on another thread so I thought I should share my experience with you.

I own a NEF Handi Rifle in .243. The first several weeks I owned mine I was baffled by the apparent lack of consistency in grouping. It would be dead on at one point and then entirely off later.

I did some online research and found that these guns have been known to have some problems with the scope bases not fitting tightly. People had the same problem that I did when the scope base was found to not be completely tight.

I took the gun back to the shop and had the base secured with loc-tite. END of problem. Simple as that.

I was about ready to give up on it entirely at one point. I love the gun now and I am about ready to purchase some additional barrels for it (probably .270 and .223)

Get this issue checked out if you have one. They're amazing little guns.