ALRIGHT....so I am getting a smoking deal on a TM m4 RIS kit w/ battery box. But do you know if it will fit with minimal work with the ICS m4?

Heres the link so there is no confusion...
http://www.dentrinity.com/shop/release.htm

I have NO experience with the "mixing and matching" of gun parts in this way. In the link the RIS kit comes with the ring and barrel mounts but the one that I will be sent will not come with this. I am looking to replace my stock plastic barrel grips right now with this TM RIS, but just not sure if it will fit correctly, so I am looking for some help and/or suggestions.

ALSO...

I have been looking at two different PEQ battery box units for my M4, so far I am looking at the ICS w/ 9.6v 1700mAh BUT the G&P PEQ w/ 9.6v 3300mAh caught my eye too.

Here are the links:
http://www.airsoftgi.com/product_info.p ... ucts_id=78

http://www.airsoftgi.com/product_info.p ... cts_id=797

Do any of you have of you have either of these and can give me a recommendation. Ofcourse the better battery caught my attention in the G&P unit BUT ive heard the PEQ unit itself is kinda cheap. Also, I could not tell in the descriptions if these had actual working lasers on them. THanks in advance.