Suspected machine guns and huge chunks of crack cocaine were seized in a raid of a Clapham penthouse.
It was all part of an operation, yesterday, targeting alleged gang members ahead of Notting Hill Carnival this weekend.
The raid was part of a large Met operation
Crack rocks, suspected class A drugs, digital scales and bundles of cash were found in the penthouse.
The police found what was understood to be two machine guns, a handgun and ammunition in the apartment.
In total 149 people have been arrested across London since 4am, yesterday morning. Police also seized £78,000 in cash.
In Southwark, police officers recovered ingredients for making crystal meth from an address.
Many of those arrested and bailed pending further enquiries will have bail conditions imposed on them, prohibiting them from attending the carnival.
Drugs and cash seized from a London property
Chief Superintendent Robyn Williams, MPS spokesman for Notting Hill Carnival, said: "We are committed to ensuring that Notting Hill Carnival remains a safe, vibrant and enjoyable event. Today's operation was aimed at ensuring that those who set out with the intention of causing trouble at carnival will not succeed.
“By once again using our team of super recognisers, we will quickly be able to identify and remove anyone prohibited from the event."
If you have any information that could help police, call Crimestoppers anonymously on 0800 555 111.