Some points are,
- Approved calibers: 9mm, .357SIG, .40 S&W, 10mm, .45 ACP
- Minimum power factor: 125(minor scoring only)
- Must have stock attached - no Sig Brace or variants.
- No barrel length limit
- No suppressors
- Must have chamber flag installed when not shooting, muzzle should point up
You can read a bit more from the link