i have never heard of this brand before and from the review under the gun you selected it's not worth the money. It's made from china and has lower grade internals. I would suggest moving to a more popular brand like KWA, A&K, ICS, G&G, ARES, classic army ECHO 1, and many more.
if you want to have a durable long lasting airsoft gun i would consider you buy a $200-250+ gun. in this range you will be able to get a full metal (or mostly metal) gun.
it looks like you are gearing towards m4's i will give you a few to look at.
under $200:
CA Full Metal Premium Sportline LWRC M6 Carbine Airsoft Gun
http://www.airsoftgi.com/product_info.p ... ts_id=7974
Combat Machine M4-A1 Carbine Airsoft Gun
http://www.airsoftgi.com/product_info.p ... ts_id=7661
ECHO 1 STAG-15 A1 Carbine Airsoft Gun
http://www.airsoftgi.com/product_info.p ... ts_id=1975
$200-250
ARES Full Metal M4A1 Airsoft Gun
http://www.airsoftgi.com/product_info.p ... ts_id=6791
Airsoft GI G4-A3 Blowback Version Airsoft Gun
http://www.airsoftgi.com/product_info.p ... ts_id=5120
here are just a few guns for you to look at, they all don't come with chargers or a battery.
I would get a quick smart charge battery and a 9.6v 1600 mAh battery
more mAh = longer charge time. ~ 1-2 shot per mAh
I hope this helps.