Same thing happened to my Hatsan semi auto but whilst I was shooting with it!
My local gunsmith supplied and fitted the part for £25. (Philip Webster gunsmiths of Wymondham)
The pics below should help out with the parts you need!
Hi Bri, have you managed to get a forend for your browning?
I have a spare (brand new) in a light oil finish if you're interested - I can post some pics later!