Wow, nobody looks at post dates anymore, do they?
That said, here's my view on a GBB MP7:
The MP7 is too big to be used as a secondary unless you barely move, but I believe a GBB MP7 has potential for mid range field use. GBBs in general have the ability to run heavier rounds without having to worry about cylinder volume. Given a proper hopup (which I doubt WE would do) you can use heavy rounds (over .28) and get range on par with an upgraded AEG. When I ran my KWA MP7 as a primary, I had no trouble outranging most of the AEGs on the field. I had maxed the hopup out, but it was perfect for the Madbull .36s I ran. In the summer especially a GBB MP7 would be a completely viable field gun, provided it has a quality hopup that can lift heavy rounds.
Note: None of this applies to AEG MP7s. I had a TM MP7 AEP for a while (and I miss it horribly since it was lost), but it had very limited range. Even R-hopped, the AEP gearbox has a very limited cylinder volume, as well as a limited velocity (even upgraded, you can't have a durable gearbox that compares to field AEG velocities). Therefore you don't have the ability to run heavier rounds, and therefore your range is much more limited. AEP MP7s are perfect for CQB though.
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