A federal appellate court on Tuesday landed a heavy blow against a New Mexico law requiring a seven-day waiting period for firearms purchases.

The ruling, which questions the constitutionality of the waiting period, could affect similar laws in place in states across the country.

New Mexico's gun purchase waiting period — passed into law last year — will be put on hold until the legal challenge by two state residents is resolved in a lower federal court. But the Tuesday ruling also provides a signal of the how the court is likely to rule on the law.

Judges from the 10th Circuit Court of Appeals reversed a lower court decision to deny a injunction against New Mexico's Waiting Period Act, which requires a seven-day "cooling-off period" for purchases of guns throughout the state, with some

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