I'm sure that if you do a search you'll find lots of posts on this...

But my vote is for the APEX. Just toss the stock barrel on it and put the APEX on a real barrel. PPS Brass would be a good choice.

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A5, 12" PPS Brass (.690) with Apex tip, Tacamo HK 416 shroud, Tacamo AK-47 Sight Cover, JCS Gold Powertube, E-Grip (APE), Core CQB Wire Stock w/ RVA, Palmer Inline Stabilizer, Lapco Cyclone Ratchet, 450 round Hopper, 48 oz CO2 with remote line. Metadyne Havoc Launcher coming soon...