Hey there, I recently got a BNIB Tokyo Marui MEU.
I can't recall if everything fired 100% perfectly when I got it... because 10 minutes into receiving the gun I had it torn down for a cleaning/re-lube/upgrading.
DSCF7018.flv video by AmosEverglade - Photobucket
This is a video of what it's doing, I was taking my finger out of the trigger guard each time to illustrate the trigger pull a little more clearly.
It may be a re-assembly problem as I had everything taken down pretty much as far as it could go before re-assembling it.
When I first took it down I lost part #GM4-49 (Little spring on the disconnecter {Part GM4-48}) and replaced it with one from a TM 1911
Here's a list of the upgrades that it has:
Airsoft Surgeon Ultra light Blow Back Unit (machined to fit MEU rear sight)
Airsoft Surgeon Hard Loading nozzle
Firefly bearing Spring guide
Firefly Lightweight Metal Floating Valve
Stock Recoil Spring
Guarder 150% Hammer Spring
Anyone have any ideas? This is my first 1911 and the first 1911 style gun I've worked on... sooo I'm still learning.