[safx]

Beautiful gun on the outside, sadly the internals by Maruzen are very fragile.

The loading nub on the underside of the piston breaks off easily, and is the usual way that gun dies.

To avoid the problem for as long as possible, you can pump the shotty smooth and proper each shot and don't over load the mags. If they hold 30rds, put in 15–20 so the mag spring doesn't put too much pressure on the loading nub.

There is an airsoft webstore in Europe that I came across once, that has the complete internal piston assembly for the CA870's. Price was around 70 euro. Sorry I don't have a link, but if you look around you'll find it.

God only knows why that part isn't availble in metal by Angs

Good luck