My brother, a friend, and I have ordered and received five of these 10 round short mags from Sportsmans Outdoor Superstore (last received today) and all five have been assembled wrong - the follower is upside down...
How can you tell?
1. Can't load ten rounds in the mag
2. Compare to the mag that came with the 15-22 and see the difference
3. The bolt won't lock back when the mag is empty
Takes about 30 seconds to fix - but be careful with the spring - it will fly! There are plenty of videos on U-tube on taking these mags apart and re-assembling them...