As with any firearm, it is not possible to accurately appraise a gun without seeing it. Condition, and original configuration will determine value. Other factors such as rarity of caliber or guage and higher grades have significant impact on value. Recommend that you see a local gun dealer for an appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You may also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
Semi-automatic shotgun
50-500 usd
50-1000 uSD
@ 1000 USD
Check the receiver.
This was made in 1988
1988
50-550 usd
50-500 usd
1980
Go to Browning.com and you can download a manual.
Parts breakage occurred on occassion in the trigger mechanism.