By best out of the box do you mean range and accuracy, reliability, functionality? What? Nothing out of the box is usually perfect and as long as your hop-up does its job barrel length had close to no effect. If you want a good brand of gun right out of the box get a VFC, they have a few DMR-ish models. If you're looking for overall performance out of the box with a DMR look and feel, then if recommend an RA-Tech Level III M14 EBR or a Systema M16 Final Evo or later (so you don't immediately need the hop mod). But then prepare to spend in upwards of $1,700 - $2,000. VFCs start at around $500 or so.
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BC & YUKON MASTER AV REPRESENTITIVE