There are a couple things that would make it better, but they're really just personal preferences.
1. metal - if the receiver was metal, it would be awesome! There's a lot of good weight to the model, but there's just something about being metal especially with this particular model that would make it seem more "right".
2. rate of fire - it is a bit fast compared with a real one, but I will take the firing performance over rate of fire any day.
This is a great model, especially if you like firing your models! Loading the mag is a bit of a pain, but a small price to pay.
Hopefully durability will be there in the long run for this model. I'm not completely convinced. Many of the parts that are spot-welded on the real steel version I think are just glued on/epoxied on the CAW due to the plastic construction of the model.
I also noticed that I can use the CAW M3A1 carts in my CAW M1A1, which is a nice bonus! I haven't tried it the other way around yet, but imagine it would work fine. The cart bodies, of course, are completely interchangeable.
First impression is I would recommend this model!
Time to get some more caps!!!!!