Police say that converting replica guns and starter pistols into real weapons could become a problem in Canada, following the arrest of a 67-year-old man in B.C. on charges linked to a case of gun conversion.

While handguns are closely regulated in Canada, starter guns -- the kind used in 100-metre track races – and gun replicas are not.

Many don't have serial numbers and they are difficult to keep track of. Still, converting them into real weapons able to fire bullets is easy, police say.

RCMP firearms expert Const. Frank Grosspietschs said that the conversion is so easy that even a "layman can do it."

Police agencies are now concerned that the conversions could become more widespread, leading to more dangerous weapons on Canadian streets.

Investigators say converted guns have shown up on the streets in cities across Canada, and three have been seized in Metro Vancouver and on Vancouver Island in recent months.

"We've got to get in front of gang violence, we've got do something to stop shooting and murders in public," said Vancouver police Supt. Tom McCluskie, of the Combined Forces Special Enforcement Unit.

"If you have any intention of selling weapons such as these, or starter pistols, with the intent of sort of turning a blind eye to where they're going or what they may be used for, you're going to be on our radar," he said.

Earlier this week in New Westminster, B.C., the combined forces unit raided a military surplus store and seized 1,000 rounds of ammunition and 100 guns.

Police allege that the owner sold three starter guns to undercover police officers, and then told them how to convert the guns. Officers say the owner didn't ask for a firearms license.

Westley William Baker faces numerous weapons charges.