HARTFORD, Conn. (WTNH) – Police are warning residents about dangerous firearm attachments that are showing up more and more on the streets of Hartford.

There are two devices police are particularly worried about. One device is a small piece of metal called a Glockswitch that makes a gun fully automatic as soon as it’s added to the pistol.

“Once that Glock switch is attached to a firearm, a firearm now meets the definition of a machine gun,” Sgt. Chris Mastroianni said.

For a legal semi-automatic Glock pistol, it takes one pull of the trigger to shoot a single bullet. But with this dangerous device attached to the gun, one pull of the trigger empties all the bullets at once.

Hartford police seized a record 367 guns in 2022

In 2021, a Houston police officer was gunned down with an automatic pistol modified with a Glock switch. Police said these switches started in the south and have now made their way to Hartford.

“It is a very small item and cheap to make. It can be sent through the mail. You really attach it to the back of a Glock handheld pistol, and it turns into a fully automatic firearm,” Mastroianni said.

Attaching a swatch to a handgun is illegal and is punishable by up to 10 years in federal prison.

The second device Hartford police are finding is super high-capacity magazines in the city. These magazines are shaped like a drum and simultaneously hold 50, 60, or even 90 bullets.

“It is a large drum that sits right in the bottom of a pistol, very awkward and weird looking if you are shooting with a fully automatic weapon, you’re going to want those extra rounds, and it makes it even more deadly, a very dangerous weapon on the street,” Mastroianni said.

Hartford police said the high-capacity magazines combined with the automatic firepower create a hazardous weapon with overwhelming force. Hartford police said they are finding more and more weapons with these dangerous attachments daily.

“We have recovered a decent amount of those, accompanied with the Glock switch, and it is a really deadly weapon to be on the streets,” Mastroianni said.