In British Columbia there is a regulation (subordinate legislation) to the
Police Act called the "Use of Force Regulation" which sets out the requirements for sidearms and ammunition issued to police officers under the
Police Act (everyone that isn't RCMP):
http://www.qp.gov.bc.ca/statreg/reg/P/Police/203_98.htm
Section 3 is as follows:
Firearms and ammunition
3 (1) Subject to subsection (3), if a chief constable carries a firearm or authorizes a member of his or her police force to carry a firearm, the firearm must be a semi-automatic pistol with the following specifications:
(a) double/single or double action-only trigger mechanism;
(b) single action trigger force of not less than 1.36 kg;
(c) hammer/firing pin block safety mechanism;
(d) barrel of not less than 76 mm and not more than 127 mm in length.
(2) Subject to subsection (3), the ammunition used in a firearm described under subsection (1) must be 0.40 calibre Smith and Wesson factory loaded cartridges with the following specifications:
(a) hollow point bullet design;
(b) bullet weight no less than 9.523 grams (147 grain);
(c) muzzle velocity between 290 m/second to 396 m/second, when fired in a firearm referred to in subsection (1).
(3) The chief constable or a police officer designated in writing by the chief constable may authorize a member of his or her police force to carry, for a special purpose, a firearm and ammunition of a type other than that referred to in this section.
(4) If an authorization is made under subsection (3), the chief constable must, on the request of the director, submit a report on all special firearms and ammunition issued and the reason for issuing them.
(5) Before a firearm or ammunition is issued under this section, the chief constable or a police officer designated by the chief constable must be satisfied that the officer to whom it is issued has completed a training course and been qualified or requalified on its use under section 10 (1).
(6) A member of a police force must not carry a firearm or ammunition other than the firearm and ammunition issued by the chief constable or police officer designated by the chief constable.
(7) Despite subsections (1) and (2), in relation to a designated policing or law enforcement unit, the director may specify the type of firearm and ammunition that is to be used.
The Police forces in B.C., other than the RCMP, are as follows:
Abbotsford
BCCFSEU (Combined Forces Special Enforcement Unit, formerly the Organized Crime Agency)
Central Saanich
Delta
GVTAPS (Greater Vancouver Transportation Authority Police Service, better known as the Transit Police)
Nelson
New Westminster
Oak Bay
Port Moody
Saanich
Vancouver
Victoria
West Vancouver
There is also the:
Kitasoo Xaixais Police Service
Stl’atl’imx Tribal Police
both of which carry firearms, but I'm not sure which ones.
To the best of my knowledge, the Glock 22 is carried by regular members of the Delta, New West, West Van and Transit Police - and probably a lot more. I just see members of these organizations regularly in my line of work.
The VPD used Beretta's for a long time (96's, as mandated by the regulation), but now have apparantly moved to a SIG 226. I saw some VPD guys yesterday and noticed that the grips sticking out of their holsters were clearly SIGs. It looks like they had new Safariland holsters as well. They had some fairly cheesy looking holsters for their Berettas - with a fold over piece of leather. I know that Delta (and I think New West) use a Safariland 6004-type holster. West Van uses a Safariland Raptor.
Several departments (West Van and Abbotsford anyway) must have access to AR-15 type rifles, either in the trunks or in the offices.... as I've seen regular uniform members carrying them to "incidents" on the news (and no they were not ERT members).