# What are the limits on muzzle energy?

The Police and Crime Act 2017 has modified [s.57 Firearms Act 1968](https://www.legislation.gov.uk/ukpga/1968/27/section/57) to define what is considered a “lethal barrelled weapon”.

As such, these are the absolute maximum muzzle energies that Airsoft replicas must abide by:

<table id="bkmrk-locality-max-fps-for"><thead><tr><th>Locality</th><th colspan="2">Max FPS for auto</th><th colspan="2">Max FPS for semi</th></tr></thead><tbody><tr><td>England, Wales</td><td>1.3J</td><td>374fps ﹫ 0.20g</td><td>2.5J</td><td>518fps ﹫ 0.20g</td></tr><tr><td>Scotland</td><td>1.3J</td><td>374fps ﹫ 0.20g</td><td>2.5J</td><td>518fps ﹫ 0.20g</td></tr><tr><td>Northern Ireland</td><td>1.0J</td><td>328fps ﹫ 0.20g</td><td>1.0J</td><td>328fps ﹫ 0.20g</td></tr></tbody></table>

Please be aware that these FPS/joule limits are purely legislative in nature, these **do not** represent limits that are in place at Airsoft sites throughout England, Wales and Scotland but **may** represent the maximum site limits in Northern Ireland.

Contact the site you wish to attend for further information on their FPS/joule limits.