I retract my previous review of this launcher, as I didn't have much knowledge of it's operation and therefore, could not reach an accurate conclusion. This launcher is great, and is easy to install once you figure it out. It does not come with any instruction, so you must be persistent when installing this should it be your first time doing so. M203 launchers do add considerable weight and bulkiness to your gun, but they also are an advantage when in certain CQB situations.
The thing that I personally enjoy about this launcher is that you can just detach it from an RIS if you wish to not use it and jut stuff it in a backpack, mag pouch (if it fits) etc. and use it at a later time when you need it.
This item is honestly a matter of personal preference. You do NOT need a grenade launcher to improve your gameplay. I honestly have too much equipment and forget to use the thing most of the time. If you like a heavy gun, this is definitely for you.
Sturdy, solid construction
All metal parts (except handguard)
Amazing build quality for the price
Takes all types of Madbull grenades, even the King grenade
Self explanatory and easy to operate
Easily detachable via RIS system (if you don't need it during combat)
Scares the hell out of the enemy team (Major plus...)
Big and bulky (although, what do you expect with an M203?)
Weighs gun down considerably
Hard to figure out how to install for first time users