You could move it forward maybe an inch or so if you mount a rail where the stock grip is. But personally, I find it much more comfortable to have the grip a few inches further than that. I suppose it's all a matter of personal preference.

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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