The locking mechanism is quite adjustable to solve that problem. It may just be gunked up and in need of proper cleaning. Assuming that there are no substantial cracks in the head of the buttstock, a quick test would be to open the shotgun fully assembled, make sure that the top-lever is locked to the right on it's own so that the barrel extension doesn't hit anything, and snap the gun shut with a bit of force (open palms should be sufficient). If this doesn't make a difference, then you're probably in need of a bit of adjustment due to age and wear.
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