[Raygis LasVegas]

Here's what I suggest for creating a C7A2:

SRC-AEG-M4A1FM
SRC M4A1 Full Metal



GP-KIT-357
G&P M16A2 Front Set ( OD )



GP-ACC-M16PGODN
G&P Pistol Grip for M16 Series ( OD )




GP-ACC-381
G&P M4A1 6 Position Sliding Buttstock ( OD )



ACTION-SP-15
ACTION High Grade Spring ( 1.5J, 380fps )



INT-96-1200M
Intellect 9.6V 1200mAh - Mini Type ( Ni-MH )

The above parts will work perfectly together. The mini Intellect battery has a very high discharge, can crank the Action 380 fps spring, and is able to fit in the G&P M16 front end. When replacing the original SRC retractable stock, it can be sold here on ASC for probably around $25 or so.

If you rather have a battery stock, here are your options. I'd go for the STAR battery stock because it's battery has a very high mah. If you prefer a smaller profile stock, just stick with the above G&P 6-position stock.

STAR-SET-STOCK02OD
Star Complete Stock Set 2 ( OD )



GP-ACC-417B
G&P M4A1 Extended Battery Buttstock with 9.6V Battery ( OD )

If the whole project seems expensive, then I'd suggest just getting the SRC M4A1, G&P OD M16 front end, and a can of Krylon OD spray paint. SRC M16 front ends are pure crap and will wobble out of the box. Replacement of that assembly is a must.

Keep in mind that you'll have to get an Elcan replica too.