Damage Industries have this Enhanced Combat System Furniture Kit comprised of the ECS stock, rail covers, and grips. The stock remains you of the CTR trock but this one's more curvey like the contours of streamlined human body. For a kit, it will cost you US$136.60 and available in 6 colours. Most probably that this will fit mainly airsoft gas blowback M4s as it's designed for the real steel ones.

ECS Stock

• Drop-in Installation on M4 receiver extensions (Buffer Tube)
• Full length storage compartments hold batteries, spare parts or cleaning gear
• Protected adjusting mechanism can’t be accidentally released
• Ambi QD swivel socket and stock loop sling mounting options
• Rounded stock heel won’t catch on equipment or clothing
• Replaceable, no-slip butt pad has same shoulder contact area as A2 rifle stock
• Solid cheek weld enhances shooter performance
• Oversized adjustment lever easily manipulated while wearing gloves
• Available in Black, FDE 30118, Coyote, OD, SHTF Brown and Foliage Green
• Available for Commercial spec receiver extensions
• All stainless steel hardware
• Made in USA from milspec materials

ECS Rail Covers

• Snap-on, snap-off installation/removal yet incredibly secure mounting
• Sure-grip textured finish
• Advanced thermo polymer will not loosen when hot, withstands extended full auto fire
• Available in Black, FDE 30118, Coyote, OD, SHTF Brown, and Foliage Green
• Comes with two 6 1/8”, one 3 5/8” and one 1 7/8” length rail panels
• Made in USA from milspec materials

ECS Grips

• Classic A2 style (A1 available special order)
• Available in Black, FDE 30118, Coyote, OD, SHTF Brown and Foliage Green
• Made in USA from milspec materials