If you really want a cheap and very chearful barrel I can recommend the Madbull Version 2 Python in 509mm. Its 6.03mm bore made of aluminium alloy and is also teflon coated. Ive had one in my EBR now for about 3 years and is really good for what I paid for it 
Re new hop rubber if your existing one is not that old then dont bother unless its split, usually just in front or behind the internal nub and can normally only be seen by rolling it back and fore between your fingers. If its old then yes it would make sense to
and while your at it either do the hop mod I did in the VSR or pop in a H nub 
Re new hop rubber if your existing one is not that old then dont bother unless its split, usually just in front or behind the internal nub and can normally only be seen by rolling it back and fore between your fingers. If its old then yes it would make sense to
