I have owned the ASGI Custom G&G CM M4RIS for about a month now and it has seen a few skirmishes in that time. It must be said that it is a truly excellent AEG. It features the same gearbox as the proline at exactly half the cost. The plastic body is a black nylon/plastic body... not gray ABS plastic like the CA, JG, E1, and TM competition. The range is excellent, and as verified by ASGI techs it does come with a tighbore barrel.
This specific ASGI Custom model comes with a full metal 2-piece RIS foregrip and a DBoy PEQ box. It does not come with a vertical foregrip or panel covers. Externally it is durable, especially the body. There is no barrel wobble as seen with TM variant M4s, although there is a slight barrel tilt issue that will not affect accuracy whatsoever. There are no receiver gaps, loose stocks, rattles, or wobbly barrels that other models may have. The included hi-cap feeds very well... one of the better ones I've used.
Overall I highly recommend this over any other sportline currently on the market for its external build quality and internal reliability. You honestly cannot find a better deal right now. I will add that I recommend a 9.6v battery for this AEG if you are looking for very nice ROF or are looking to upgrade it later. I'm running an 8.4v 1500mAH battery with decent ROF but it will last the day; I doubt it could pull a stiffer spring.
-Build Quality and appearance
-No notorious barrel wobble
-Excellent gearbox and internals
-Tight bore inner barrel
-Easily adjustable hop-up
-Versatility in terms of accessories
-Moveable charging handle and forward assist
-450 Round HiCap
-Slight barrel tilt issue
-Wiring appears to be of a very small gauge
-Plastic body (although durable)
-No metal flash hider included
-No battery/charger included
-Moderate rate of fire on an 8.4v mini battery
Rating: [5 of 5 Stars!]