I wouldn't start bashing MP7's now. Sure, it's an AEP, but with a couple nine-ball upgrades it could be a pretty good sidearm or CQB gun.
I rebuild these and mod them like a baker cooks rolls. Its not a bash. And as far as this ops condition report goes. That is a fair price, he may no like it, but thats not my problem. Hell, I will give you $30 AND the mask if it makes you feel better.
Also, there are much better things to do to an AEP to increase ability than the high priced nineball stuff. Both nineball and the seller have the same problem. AEPS have an extremely low resell value, even upgraded to the maximum, mainly because they are so low in price in the first place. Therefore, there is very little incentive to sell the gun with the upgrades, and then the parts take a long while to move. Nineball parts are like what systema used to be, they are amazing, but only dominant because they are the only dog in town, system is still amazing today, but you can get comparable performance for much less. Might be 1-2bps less, .05% less torque, or not last as long as a nice systema, but for the price you can buy 2. Some people will still only buy systema for its guaranteed quality, and thats fair too. To each there own.
To the OP: If you don't want the mask, I can offer you a scope or something instead, you just have to understand that out of all the Mp7s available, a big 5 rebrand (Taskforce) is rock bottom on the list. Theres no way your going to get $120 used for a gun that retails for $70 new.
If you want to work something out, pm me.