I have a Aftermath Knight cqb m4. Their are a few external problems. I've put at least 1.000 bbs through it without a problem. The gun is wired to the back and has a crane stock. It shoot's 290-300 fps with .23 gram bbs. The foreword assist button is functional (doesn't reset gears), but I lost the actual pin that gets pushed somewhere at CowTown. The rail has slight wobble. I've tightened all the screws, bit I still can't find what's causing it. Slight problem with the charging handle becasue the dust cover doesn't open when the charging handle is pulled. The gun itself is pretty solid and functions with no problems. If you have any questions or if your interested, message me or my number is 623-565-7247 (call or text). I was looking to get $100.
It includes:
foregrip
2 rail covers
Madbull mock silencer (
http://www.airsoftgi.com/product_info.p ... ts_id=1984)
1500mah 1.2 volt crane stock battery (7 cells)