This is one of the three pieces that make up the Warhammer 40,000 Barricades Set 2. A complete set is made up of three piece resin barricades with each section approximately 6″ / 150mm long. Based on the photos I have seen I have the two curved sections (of which this is one), but not the straight middle bit.
The catalogue entry read “There are times when Imperial forces must make do with the materials at hand to construct barricades to help fortify areas to defend, and repel the enemy.”
Master model by Simon Harris around about 2002. The full set sold for £14.
Forgeworld product codes: FWF025 then TR-40K-S-022.