Hi Guys
I put my HW90 .177 into a different stock and it would not cock unless I pushed in the safety button during cocking. I checked the old and new stocks and it seems that the trigger block sat lower in the new stock than in the old, (I need to cut away some of the stock around the trigger unit to get the trigger guard to sit properly). At the mo I'm shimming the stock with washers to make the trigger guard sit flat, also, if the front screw is over tightened, it seems to make the trigger guard catch on the trigger, pulling it back. i think screw tension is critical as it can move the guard quite a lot.
It is possible that not all of the stocks are the same.
When I've cut away some of the wood, I'll let you know.
regards
Steve