Hi guys, I bought two of the GR20's last year, quite early in their distribution I think.
I found some positives and negatives with them.
Positives: First off they look the nuts don't they, can't fault them there. Ease of changing to use for different noises/ poss smokes havn't seen any yet though. When you throw them they go where you want them to (in CQB) they don't roll all over the place.
Negatives: Picking up the pieces. I overcame this by drilling a 2mm hole and using a tiny cable tie throuh the spoon and round the barrel attachment. Fishing braid would probably be easie