LG90 Problem With Loading Hatch Flying Open.

[zooma]

We have a Walther LG90 in our club that keep blowing the loading hatch open and when this happens it throws out the seal that is mounted in the hinged loading hatch - the seal that faces downwards when closed.

After several fretful events each night where every shot snaps open the loading hatch and throws out this seal the rifle mysteriously settles down and then behaves and works perfectly all night.

When we are having this problem and the loading hatch is closed the rifle can be lifted by the loading hatch so the mechanical lock is very strong suggesting that something is releasing this locking latch when the trigger is pulled.

Whatever it is that causes the problem it does eventually disappear so we are left very frustrated with no clue as to what the problem is and why it cures itself.

After a successful nights shooting (eventually) with the LG90, the rifle has won back favour and is well liked BUT when taken out of its case and shot the next night we are right back to square one again as the loading hatch blows open we have to play the "find the seal" game for far too long before the rifle becomes shootable again.

Fitting new seals does not help at all.

Does anyone have an answer or can let us know what may be going on inside this temperamental LG90 rifle please?