Many other Electros, but none compared to this one.
M3 Patriot Stars & Stripes (Blue), Bob Long In-Line Torpedo Regulator, Modified Stock Bolt, Dye Xcel 14" Barrel, Ricochet AK Hopper. Try and Go Low-Pressure if you can.
Keep The Stock Barrel, it outperformed my Xcel, along with a Lapco Bigshot and a J&J Ceramic. Get a good hopper, the Ricochet AK goes up to 12 BpS. Also, do a trigger job to lower the trigger pull.
STOCK BARREL! amazing!
The Plactic Grips break really easy.
Overall the gun is amazing. Ive shot many markers and this is one of the finest that I have ever used. If you have a hopper that can keep up with it, then its even better. The gun, when stock, shoots very well, but with subtle upgrades it improves tremendously.
If you have an opportunity to try one of there, by all means do it. Its an excelent marker and I highly recomned it to anyone.