Bought one a couple of years ago. Absolute blast. 100% reliable, eats anything.
Downsides:
If you insert a loaded mag with the bolt locked back, it will over-insert and jam the gun up.
Can be a chore to yank it back out.
The shape of the magwell is enough different that the Magpul PCC drum will NOT
fit. Bummer. Thinking of doing a bit of plastic machining on the Extar to get it
to fit, I really want to run the drum!!