Been through this and wasted lots of money. The Mac-1 Scope Mount is very solid and won’t mar your gun. You can use it as a scout scope as I did or you can turn it around and ramp it over your receiver with a more conventional scope. It’s has a cut out to help your loading. It’s $50 but it’s worth it cause it’s well made and designed. I would encourage the scout scope just works well on a pumper.Mac-1. http://www.mac1airgunshop.com/product-p/bjshia.htm