Don't get it! basically, the 430mm inner barrel is pretty perfect in terms of cylinder volume for VSRs. I ordered a PDI outer barrel and they sent me the 690mm version which is for the 554mm inner barrels, but I'm keeping my 430mm inner barrel inside it.
A huge mistake people make in airsoft is thinking that the longer the barrel the more accuracy you will have, it isn't true. I've seen pistols out-range assault rifles!
A huge mistake people make in airsoft is thinking that the longer the barrel the more accuracy you will have, it isn't true. I've seen pistols out-range assault rifles!