Magus' Spell Combat question

[Reebo Kesh]

Hey guys, I don't quite understand how the Magus' Spell Combat works. If the Magus in in melee and takes a full round action he can attack with a one handed weapon and cast a spell with his off hand.
Does the spell just work or must the Magus make a Concentration check? If so what is the DC for say a 1st level spell?
Thanks in advance

[SunsetPsychosis]

If the magus is threatened, he makes a Concentration check as normal for casting in melee range, at the normal DC of 15+ double the spell level. So casting a 1st level spell would be a DC 17 Concentration check.

One neat trick is that you can take a 5-foot step during a full attack action, meaning that you can start 5-feet away from the enemy, cast the spell, then step in and continue the attack.

The Lunge feat is excellent for a magus for the same reason. If you're not directly threatened, you don't need to make the check.

[Josh M Foster]

You can also ignore the check, if you want, but you'd suffer an attack of opportunity, and that could disrupt your spell, forcing a concentration check anyway.

[Reebo Kesh]

Thanks for clearing that
Reebo