Another Magwell Grip for the AR Platform is now available at Mission First Tactical. While it's not an original thing as there have been some already released in the market previously this allows midpoint balance and less effort to direct muzzle. Since this set a little bit further from the magwell area, this will not interfere with the magazine.

We always find ourselves holding our M4s at the magwell area to achieve a midpoint balance when sometimes holding the handguard or fore area stretching our arms and this will help in having a comfortable grip. There are pressure pad wells for accessory activation such as lighting or laser and there is storage for 2 CR123 batteries.

You can order this at the online store of MFT which you can get for US$29.99. This might not fit your AEG yet, but you try it on M4 gas blowbacks.