[aznpos531]

A full gun for sure will get seized and destroyed at the border. As for parts, it depends on what parts you try to import. Some are prohibited (e.g. receivers, magazines with fake rounds, grenades, suppressors etc.)
Here are a few good reads:

linky 1
linky 2
linky 3

Most, if not all internals for airsoft guns are allowed in. It's mostly the externals (receivers etc.) that have problems.

Quote from FAQ:

Okay, so I can’t import guns. What about parts and accessories?

Yes. The good news is that most parts and accessories, including most magazines, can be successfully imported by individuals without requiring a BFL. Examples of things you CANNOT import:

* AEG magazines with fake cartridges (i.e. P90, G36, SG 552 mags)
* Frames, receivers, and metal bodies
* Suppressors and silencers
* Prohibited-length outer handgun barrels (i.e. USP Compact, Glock 26)
* Hand and 40mm grenades that look real

Examples of things you CAN import:

* Magazines for AEGs and GBBs without fake cartridges
* Outer barrels for most guns
* Inner barrels of any type
* Handgun slides
* Flash suppressors
* Scopes, red dot sights, iron sights, lasers
* Rail systems and scope mounts
* Springs, bushings, gears, pistons, or other gearbox parts
* Batteries, BBs, loading tools
* Helmets, goggles, body armor, tactical vests, camouflage


Note that CBSA inspectors have discretion to detain goods of questionable legality, and although it shows up on the above list it MAY be held if you draw an inspector that is particularly ignorant or of foul demeanor. That said, I have yet to hear of any seizures of the above items.

Prohibited-length handgun barrels may or may not be stopped. Most outer barrels are not dimensioned internally to even appear capable of firing a real bullet, and faux rifling marks typically extend only a few millimeters down the bore. However CBSA inspectors are not firearms experts and if they think there's a potential of it being usable in a real gun, they'll seize it rather than risk their jobs. Best not to take a chance on it.