Masterpiece Megatron's Unofficial Upgrades

So I picked up MP Megatron along with his Just For Kids upgrades. I gotta say they look amazing on him in gun mode, and for those who didn't know they added hand gun replacements that are metal and replace Megatron's lower legs.
To anyone who has these, does the silencer part stay snug to your gun barrel is it just hanging on there?
If anyone has any questions regarding Megatron, his accesories, or the upgrades, please feel free to ask =].
To anyone who has these, does the silencer part stay snug to your gun barrel is it just hanging on there?
If anyone has any questions regarding Megatron, his accesories, or the upgrades, please feel free to ask =].