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951 Posts
Having worked on one personally, it is a complete upgrade nightmare.
You have to take the whole thing apart. (bottom ris rail, upper rail, 43029682139058x screws etc etc)
The feeding system was failure prone from the start. The manufacturer didnt take the time to get rid of all the burrs. The feeding system uses a triangular plate to push the bb from the mag to the barrel. The plate can (and will) get stuck somewhere along the way, thus proving hard to cock.
Furthermore, it is one solid piece of equipment, but IMHO overpriced parts.
Pics or it didnt happen:

You have to take the whole thing apart. (bottom ris rail, upper rail, 43029682139058x screws etc etc)
The feeding system was failure prone from the start. The manufacturer didnt take the time to get rid of all the burrs. The feeding system uses a triangular plate to push the bb from the mag to the barrel. The plate can (and will) get stuck somewhere along the way, thus proving hard to cock.
Furthermore, it is one solid piece of equipment, but IMHO overpriced parts.
Pics or it didnt happen:
