Here is a thread on another forum regarding some information about the Airsoft GI G700. I recommend reading through it all. There are several concepts in there that are important, and I advise you read through them.
http://miairsoft.proboards.com/index.cgi?board=spring&action=display&thread=33728
As for the G98, another thread has some good info for you. However, the thread does not start out about the G98 and you kind of have to read certain parts for the concepts that involve your questions.
http://miairsoft.proboards.com/index.cgi?board=spring&action=display&thread=37688
The second link I have is not super helpful but has some good points in there somewhere.
Basically, both rifles you have linked have been upgraded with Airsoft Gi parts. The reason these parts are cheaper, is because they are lower quality. While they are better than stock parts in most clone rifles, they are not as good as say Laylax and PDI parts.
I would personally buy a stock UTG Mk96, rather than an Airsoft Gi upgraded one. I would use the extra cash to buy a few upgrades, and save up for some others to purchase at a later time. It will be more expensive, but worth it in the end.
P.S. Post 1111....this does not happen every day folks, this is history. :
http://miairsoft.proboards.com/index.cgi?board=spring&action=display&thread=33728
As for the G98, another thread has some good info for you. However, the thread does not start out about the G98 and you kind of have to read certain parts for the concepts that involve your questions.
http://miairsoft.proboards.com/index.cgi?board=spring&action=display&thread=37688
The second link I have is not super helpful but has some good points in there somewhere.

Basically, both rifles you have linked have been upgraded with Airsoft Gi parts. The reason these parts are cheaper, is because they are lower quality. While they are better than stock parts in most clone rifles, they are not as good as say Laylax and PDI parts.
I would personally buy a stock UTG Mk96, rather than an Airsoft Gi upgraded one. I would use the extra cash to buy a few upgrades, and save up for some others to purchase at a later time. It will be more expensive, but worth it in the end.
P.S. Post 1111....this does not happen every day folks, this is history. :