M4 and USP compact tightbores?!

[armyamy 10]

Im looking for a tightbore barrel for my full size M4 and my USP Compact, if anyone could point me in the right direction it would be much appreciated

 

Cheers

 

Amy

[MZKaleem 151]

i dont think your gonna get a TBB for a gun that has a barrel shorter than my hand span