This was one of the best nozzle setup I've had on my 1911, wish it had lasted me longer. Don't know how but the nozzle blew out a hole in the back, had to upgrade to a aluminum nozzle.
I don't think Aluminium Nozzle would be the best anyway! If you are taking the aluminium nozzle which mean some other parts need to be changed with Metal as well. I think the nylon nozzle is good enough for any critical situation.
Nozzle sits way too tight in the standard GHK barrel extension, Bolt does not cycle.
Good price on decent barrel. A little more play than what I'd like but works well don't forget to add some thread lock to it.
good quality and cheap also working well on my HI capa