"I have been playing airsoft for about 5 years and most of my experience is with gas rifles. I have had an Echo1 Ar57, 2 Lancer tactical m4s.
Internal build (5/5)
This gun features ICS's tried and true spit gearbox design. For me, someone who wants to begin to tech, this is beyond amazing because it allows upgrades to be much simpler. Plus, if I mess up, I don't have to buy a whole new gearbox or take it to a tech, because you can just buy the lower or upper half. Out of the box it fires at about 18 rps with a 9.6 butterfly. Although the descruption says the gun is front wired, it's actually rear wired. One issue I found was that it's not a fan of the G&P hopup
External build (3.5/5)
It's almost entirely high density polymer. My biggest issue with this is that even the outer barrel is polymer. This is a personal issue because I added a suppressor (more on that later). Every thing that matters is metal: the charging handle, mag release, trigger, dust cover. The crane stock is of bad design, where you have to unscrew the back to access the battery.
This gun is comfortable, lightweight, and extremely accurate out of the box. I achieve a high rate of fire with a simple battery, and it's so fun to shoot that I run through a high cap before I know it. The only thing that could drive this rate down is that because of the motor is very power hungry, and goes through the 1600mah 9.6.
An absolutely flawless gun, especially for starting out. It's powerful enough to keep up with more expensive guns, and reliable enough so you don't have to pour money into it. I'm in love with it and I'll never get ride of it. The .5 that I took of is due to the external build. This isn't due to polymer, I owned a Kross Vector and a ACR and both are mainly polymer. This polymer is certainly not as high class as those however those guns are both over double the cost.
What I did to it:
Immediately I replaced the inner barrel with a longet G&P barrel for more range, I put the 160mm Angel Custom HIVE suppressor (which is beautiful), changed the stock for easier access, and loaded it with magpul rail covers and magpul vertical grip. I plan to put in the TITAN mosfet, Angel Custom trigger, and 11.1 LiPo