Not really a quality review as I have only owned this for an hour, but since it is new:
This does not fit well in my echo1 HK416.
I pushed it up and got it to feed - actually I got it to fit in I'll bet. I'm glad I tried it again. The screws in the front and back are two Phillips on the bottom, flat head on the top back and missing on the front top (looks to have broke off) The screws all have rust. The bullets look good (maybe the other guy is looking at the primers?)
The mag that fits in the gun looks exactly like my echo mags so I just tried it again and it snapped in perfectly. I opened up the spare side (plastic by the way) and put some BBs in it. This time it did well. I thought I noticed a misfire but I'm not sure. It did dry fire near the end because the bottom inside is flat and I had the gun leaned away from the feeding hole. tilt and a push of the button and I was back in business. Something to think about when it is low. I had also held the button down and fired 900 straight the first time. I put in a 9.6 battery and got it to misfire 4 or 5 times unloading a full mag
It winds up really fast and the button to wind it is very conveniently located in the front middle of the spare mag. There is also a manual winder on the bottom but you can tell you are spinning the motor too.
So it winds fast
holds 1000 or so, Either way I'm not counting
Does feed well (not sure what I did the first time)
Fake bullets do look nice (if you are into that)
Plastic construction on the 'spare' side
rusty screws (not that appearance is important to me or I would dock it)
when you pull the bullet back to open the well on that side the plastic looks like it is about to come apart but it is supposed to I think.
Rating: [5 of 5 Stars!]