Two products released by Magpul USA last September starting with the MOE Midlength Hanguard and the Angled Fore Grip Version 2. Please do take note that this items are released by Magpul USA and not by Magpul PTS, their Hong Kong based airsoft and training division. This may fit some existing M4 gas blowback rifles and rails made for them without modifications but check first or wait until Magpul PTS releases the airsoft version.
"The Magpul MOE Hand Guard for AR15/M16 rifles with mid-length 'direct impingement' or external-piston gas systems combines the light weight of a standard hand guard with modular flexibility. Slots at the two, six, and ten o'clock positions allow for optional mounting of Picatinny rail sections for tactical lights and other accessories. Reinforced, heat-resistant polymer construction provides operational durability without the weight and expense of an aluminum rail hand guard. Front extensions and lower lip provides additional operator protection from hot front sight assembly.
Unlike conventional vertical fore-grips, the Magpul AFG2 (Angled Fore-Grip) takes into account natural body mechanics and provides a comfortable and stable user interface that reduces fatigue and allows for more precise weapon control. By positioning the shooter's hand high on the centerline of the bore, the AFG2 helps mitigate recoil and control the weapon, facilitating faster, more accurate follow-up shots.
The AFG2 is a slim line design that is shorter in overall length and width compared to the AFG1. Smaller size allows for compatibility with a wider variety of rail systems, rail covers, and accessory mounts."