"A buddy of mine and I got a pair of these to use at Operation East Wind. I was optimistic that the original advertising information about A&K's newer (2011 and onwards) AEGs being lauded through this retailer were accurate. Likewise, I was also looking forward to an FPS of around 400.
What I will say is that A&K's exterior build quality HAS improved since their original (pre-2011) stuff and since the "crackdown", buyout and overhaul of A&K in 2010.
Unfortunately though, the internals seem to be the same old garbage. As such the advertized FPS of 400 was waaay off.
Both my buddies and mine 249 MkI's were shooting between 260 and 280 FPS. Not acceptable for a support weapon and not even in the ballpark of 400 FPS.
We also bought spare belt boxes/box magazines - and it was lucky we did. Each gun came with one and we each had a spare. Of all four we could only get two to actually work. To their credit though - when they did worked, they worked great!! (the ones that did work - always worked so they weren't on again off again).
The only other complaint I'd have about this gun, it's that the rear stock began wobbling and I'm not sure yet what can be tightened to help address that. It's not detrimental (yet) but it is annoying.
Apart from that, the gun held up to all 9 days at OP East Wind, and after replacing an "O" ring on the piston (so there actually was some air pressure now) the gun was shooting like a dream and just under 400 FPS.
I definitely would recommend this gun - but, know up front that the internals are still lackluster and that the gun will not shoot anywhere near the advertised 400 FPS.
As such, you'll either want to be prepared with a replacement mechbox or be prepared to overhaul the stock one to make it gameable.
Also be aware of the notoriously unreliable belt box/box mag."