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I'll admit I'm being a tad bias, my comment is based on you using heavy ammo.
Are you using at least .32g BBs in it? Because it really does make a huge difference.
I'm running a KSC USP compact (pre-system 7, so it's OLD), before and after Rhop I was hitting torso's at 140ft on .32g BBs
At 20ft, unless you're running something really light like .20s, I wouldn't expect there to be more than an inch of deviation. 1.5" at 20ft means you're probably getting REALLY horrible accuracy out at 100ft.
There's some common misunderstanding on barrels in airsoft. If the barrel is of good quality, that is the only feature that actually matters.
If you notice an improvement between the stock barrel and a PDI 6.01, it's the quality of the barrel that made the improvement. It legitimately has nothing to do with the bore.
However, the hop rubber is going to make the biggest difference, it's similar to the rifling effect. Without a good hop rubber, you're basically shooting a musket with an oversize barrel.
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