for the a5a2 foregrip would i need the sorty one to have a expansion chamber and the foregrip on?

You can get a shorty one or the MP5 mag type if you like. It really depends on what kind of x-chamber you have. I think all the A2 foregrips come out of the same mold, some are just cut down. If you want to get the standard one then cut it out yourself, that's an option too.

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