"The product doesn't come with any instructions, which makes figuring out how to remove the barrel clamp at the front a pain, but aside from that, this is great. It's got nice weight to it, and works very well. Trigger wasn't very sensitive, either, which is good. Don't want that firing off in middle of a battle.
Overall, this gun is excellent, and for the price, you have to get one. The long version should work on any M16 or full length M4 carbine. If you plan to mount this on a SCAR or other shorter length weapon, the short version is what you want.
adds great versatility to your loadout
Cons: Doesn't come with a grenade (there is a space for it in the package, but it was either removed, or custom ordered with out it, which explains the low price)"