I asked Staccato this exact question,,this is what they said...
Hi David,
Thanks for reaching out. The XL is too long for IDPA regulations, I apologize. The only model that will work is the C2 and requires a single side safety to fit the box. If there is anything else we can do to assist you, please let us know! Our Customer Experience Team is here for you Monday through Friday, from 7:30AM-5:00PM CST via email or by phone at (512) 819-0656.
Have a great day!
Staccato Customer Experience Team