BCM Europearms BARREL BLOCK single shot. Configurations: 
<p>- 223 Rem barrels  660 mm
- 6 PPC  barrels  570 and 610 mm
- 6 BR Norma  barrels  610 mm
- 6.5x47 Lapua  barrels  610, 660, 710 mm
- 6.5/284 Norma barrels 650 and 710 mm
- 30 BR  barrels  500 and 610 mm
- 30 BCM  barrels  610 mm
- 308 Win. barrels  500, 550, 610, 660  and
</p>
710 mm
<a href="//commons.wikimedia.org/w/index.php?title=User:Dr.bike&amp;action=edit&amp;redlink=1" class="new" title="User:Dr.bike (page does not exist)">Dr.bike</a>
2011
<span class="int-own-work" lang="en">Own work</span>