It can be a little tight... I never notice because I almost always have the bolt open when I load at the range.
But I did just give it a little test. Definitely tight and required an extra little snap in.
- Make sure you actually only have ten rounds in your ten round mag - the last round should be on the port side.
- You should be able to push the last round down into the mag so that the round almost disappears below the side edge of the mag - this is what happens when you load a full mag with the bolt close.
When you load up the mag, make sure the tip of the bullet isn't jammed into the front of the mag... when loaded, whack the mag on it's back side to move the rounds to the back.
I recommend getting some snap caps to practice cycling rounds at home.
A good magazine is most important, however some mags need a little use before they are real smooth.
- not an expert, but have been there.