The VZ58 does not have a barrel extension -- your post is a copy/paste is BAD INFORMATION from another post where someone didn't realize what in fact a barrel extension was under the eyes of the BATF (it goes at the end opposite of the muzzle attachment) and has been incorrectly reposted numerous times over the years. They also forgot the hammer.
The VZ58 does in fact have a hammer, a linear hammer, that you choose to ignore with the assertion that it is a striker. As mentioned, a "striker" is a part which serves as both the "firing pin" and the "hammer." The firing pin being a separate part from the VZ58's linear hammer, means by legal definition, that the VZ58s linear hammer IS NOT A STRIKER, by all practical, dictionary, and legal definitions. B/c the VZ58's hammer doesn't pivot on a pin doesn't make it any less of a hammer...
In fact, as posted earlier by HowlinMad, a website devoted to 922r compliance cites the VZ58 as both having a hammer and 16 parts, thereby requiring 10.
http://922r.com/Shockingly, that site agrees with the consensus of the resident experts here on this forum (a sub board devoted entirely and solely to the VZ58, that you deem less credible than your echo chamber "experts") that the following is the BATF 922r applicable parts for this weapon system.
1 Receiver
2 Barrel
3 Muzzle attachment
4 Bolt
5 Bolt carrier
6 Gas piston
7 Trigger
8 Hammer
9 Sear
10 Disconnector
11 Buttstock
12 Pistol grip
13 Forearm, handguard
14 Magazine body
15 Follower
16 Floorplate
I have termed the linear hammer a striker in the past, but this "beating a dead horse" of a thread is precisely why I decided to cleanup my terminology for this part earlier this year...
At this point, any objective and reasonable person should be able to establish the facts of the matter. I hope the mods shut this down as I'm unsubscribing.