IMO these 'conversions' are built for the market that knows nothing about guns except what they look like roughly. Looks like a Glock, goes blang, bullet comes out muzzle, it's a Glock.
That does increase the psychological aspect.
A victim confronted with a block of wood with a radio aerial and a door latch hooked to a draw spring wouldn't react the same way they would to having something that looked like the guns they've seen in movies pointed at them.
You can imagine someone pointing what is obviously a bicycle tire pump at you and saying "Freeze MF". Its not likely to prevent you from trying to show them a new place to hide that pump.
PS
An East German company used to import an air rifle to the US which was made from real AKM parts including the receivers. The BATF stopped them from impoting them because it was easy to reconvert them into working AKM if you could find or fabricate just a few parts most of which were available.
Here is the Russian made version.
The earlier model differed in some details of construction, and if I'm not mistaken was built in East Germany as a training rifle.
AK-74M / AKS-74 / AKM look-alike Yunker-3 Air Rifles
IZHMASH' Yunker-3 semi-automatic CO2 rifle is designed for target shooting. 95% of its parts are genuine AK-74 / AKM assault rifle parts. Metal BBs (Ball Bullets) are used as bullets, which are fed directly from magazine through the MP-841K valve unit mechanism. This unit accomodates 18 BBs as well as gas bulb. The package also includes 200 BBs, service kit, manuals & complimentory AK canvas sling.. AK-74M version includes polymer folding buttstock & polymer handguards, while the AKS-74 has a skeleton buttstock & & wooden handguards (Afghanistan-era look-alike). AKM version has laminated furniture, brown polymer pistol grip, AK-47 bakelite magazine (NO LICENCE REQUIRED)