I remember when one of the big box stores (early’70’s) were selling the 340 with a scope package. The scopes were Japanese “unbranded” scopes, so I suggest the mount came with the rifle. Advertised price was $69.95!
I had one circa 1981-84. It had been abused so I touched up the metal and refinished the stock. With a decent scope and handloads it approached moa accurate. I also got nearly as good as accuracy with a cast bullet. Made my first deer kill with a cast bullet with it.
Not pretty, but decent rifles. I always wanted one in .22Hornet or .222.