Makes your hands free.
Keeps marker in firing position.
Could limit motion at times.
I got this baby even before I ordered my A-5. I put it on my old stingray. It worked just fine. It worked even better on the A-5 since it has a built in ring in the rear of the gun. This thing really comes in handy, you have both hands free when reloading, climbing or just carrying stuff on the way to the field. Great for woodsball, and in games that take a long time it will keep you from lugging around the weight of your with just your arm for an hour. Always keeps marker in firing position, just like real military guys use. Looks cool too.
I take this thing off when I have to crawl, pretty much impossible ot crawl with. Also, at times can restrict motion when you need to fire straigt left or right...this is no problem, since you can take if off in half a second!!
Sweet product. The military uses them, must be good! Get one!