I've used this in multiple games and it's never given me any problems. I've mainly used it in forest area fields and to my surprise it was effective up to about 50 feet, but works best in close quarters.
After a few games the orange tip fell off and I couldn't find it.
I've used it on a G&G GR-16 and a KWA KM4-RIS (both full metal) and it attached with no problem and stayed on during many games of running, jumping, crawling, and diving.
The added weight is something to watch for, especially with a full metal RIS, unless you're used to carrying a heavy gun.
I would also recommend using it on M4 style rifles, as opposed to M16 styles, due to the short length of the launcher.
For anyone looking for an effective CQC gun, a giant shotgun, or just something to attach to add intimidation, I would highly recommend this.
I've had this for almost a year and it hasn't let me down and is definitely worth the price.
Easy to use
Stays secured to rail
Easy to disassemble
Orange tip fell off
Added weight: suck it up and deal with it