Just be aware a bull barrel will put you into open class, which might be what you want, ie variable power scopes, free float barrel, match triggers etc.
I found it cheaper to go 'standard' with my original set up, as the A2 pistol grip, flash hider, hand guard and new scope was all I had to add.
16" barrel is fine at 100-300m, but 20" barrels will come to the fore for 500-600m.
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