Inner barrel question
 

I bought a KWA outer barrel for my M4 and the stock inner barrel will not fit inside. My thoughts is I need a tightbore barrel. There website says a 6.05mm +/- .03 but i'm sure mine is a 6.06mm and it will not fit. Any ideas ?

Those measurements are for the inner diameter, not the outer.

The outer diameter on all inner barrels should be the same.

KWA outerbarrels are tighter than regular outerbarrels.

this is to decrease the amount of wobble inside to increase the accuracy.

thus some inner barrel will not fit inside.

So would I be better buying a different one or lubing up mine to see if it will fit ? I understand those measurements are the inner but didn't know if the outer would be same too

madbull barrels fit

That's actually the one I was looking at. Glad someone confirmed it too. Thanks