Crosman CROSMAN 150

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I bought this Crosman 150 earlier today at a local pawnshop. I had been watching it for about a year. I installed a CO2 cartridge and fired it without a pellet a couple of times. It seems fine.
 
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Difficult to photograph but the rear sight has been filed down lower than the sliding breech cover in front of it. It is not possible to see the front sight and the rear sight at the same time.
I will try putting a washer under the rear, if the screw is long enough. If not I can easily make another sight that is taller.