The Beretta M3P is an Italian shotgun.
The M3P was created in light of the successes of the Benelli M3 and Franchi's SPAS-12 and SPAS-15. The weapon was produced for a few years in the 1980s. Within that time, it was used by the French RAID and the Italian Gruppo di intervento speciale in small numbers, while the French Police used the SPAS-15 and the Italian Carabinieri used the Benelli M3.
The weapon operates similarly to a SPAS-15. It has a folding stock, and unusually for a Beretta shotgun, a detachable box magazine.