Yeah, I actually got the D-Boys brand one...
It's abit tricky and weak on the spring-clips that hold the Grenades in place that put pressure on the firing pin , so sometimes I have to hold it just right...
But, I got it dirt cheap, and it's all metal except for the hand guard part. Very durable, and it came with the extra attachments so I can fit it to almost any RIS or M4/m16 under-barrel set up.
I've been happy with it.