The m4 ris is a spec ops weapon currently in use by various U.S. special operations forces. A derivative of the Colt m16 series, this gun however, is a more versitile than the m16a- being around 12 inches shorter.
Marui redesigned their poplular M4 in 1999, hence the M4-RIS. They added a rail interface system and a replica laser unit to fit the battery. The RIS comes with two rail guards and the foregrip. So what you're getting is simply a TM M4 with an RIS and box to hold a battery in.
The gun feels good in the hands. It is not 100% ergonomic, but it feels good. It has a good weight. It weighs close a real AR-15, at about 6 pounds. As for sights, exactly like the real ones. They are peep hole sights with two changeable sights, one for close ranges and one for longer range or more exact shooting. The sights are fully adjustable, with two knobs to sight the gun in.
The RIS. It is, as previously stated, full metal. It adds weight, gives the gun a better feel, and it gives you something to mount a flashlight, laser, battery box, etc... The replica LAM unit is a good idea and looks cool, but it slightly gets in the way of the sights. To make up for it, it comes with sights on the laser unit which are mounted slightly to the left of the unit. These are good for cqb, but aren't accurate past 30 yards.
The hopup adjuster is located under the dust cover. Unlike the CA m4, the cocking handle actually opens the the dust cover. The hopup unwinds every once in a while when you dry fire, but you shouldn't be dry firing too often anyway. But as far as hop up goes, it is easy, and conveniant to adjust.
An advantage to having an M4 is the removable carry handle to mount a scope. The problem with the M4-RIS is that, unless you mount the laser unit to the side, you cannot use the rail for a scope(the front sight would be in the way also). If you did mount the scope to the side, it would get in the way of your hand, when you aren't using the foregrip. In my opinion, as cool as it looks, the LAM unit does more harm than good.
As for barrel wobble, at first it isn't apparent, but after long use and dropping it once it is there. It, currently isn't so bad, and after tightening the screws it isn't a problem.
As far as performance goes, internally, this is a version 2 gearbox. Like all Mauri gearboxes, this works great. The eg1000 motor gives this gun a good 900 rpm (somethin' like that) with stock internals. It has good range, its accurate within 2" out to 30 yrds; 6-7" groups around 50 yds, and could probably hit a man at 60 yrds. Nothing else to say here.
This is a well rounded rifle. With a good range it is good enough to be used for medium to long range battles. With its relativly short size , only three inches longer than an mp5, and a good rate of fire, it is a good choice for CQB.
Another great advantage to this rifle is its upgrade potential. This has more aftermarket products than a MP5. You can turn it into anything from a bushmaster, to a armalite bullpup. In my opinion, leave the telescoping stock on, unless you are going to use it for sniping (you would have to get a much longer barrel). There are better ways to put a larger battery on this rifle than sacraficing the use of a telescoping stock (they will be more important than you may think).
more later!!!
