I am confused with this, but this doesn't seem to have any upgrades with this AEG at Evike.com... "This AEG is A&K's newest release after the M249! A&K has grown to be one of today's most reputable manufacture with the best M249 series AEG in the market today. This new release of the A&K features the best of A&K with the best external parts and internal parts.

The AEG is a 'CUSTOMIZED / UPGRADED AIRSOFT RIFLE' out of the box for a fraction of the price of CA with higher reliability and performance. The external finish of the rifle is nice, with realistic weight, feel and look. The internal is very nicely done shooting at amazing power and accuracy."