Buffer tube & stock set
Larger battery space
For M4/AR-15 AEGs
If you're checking out alternative stock options for your M4/AR-15 AEG, the Delta Armory M4/AR-15 Battery Stock & Buffer Tube Set should be on your radar. This stock is the same offered on Krytac Trident and Delta Armory AEGs, boasting QD sling sockets on each side, a conventional sling loop in the centre and a comfortable and grippy rubber butt plate for traction in all weather conditions. 
Like the "Crane" stock, the Delta Armory battery stock has a comfortable sloped cheekpiece, but unlike the Crane, the Delta stock has texture along the top for comfort and grip, encouraging a consistent head position when shooting. The highlight of this stock design is its enlarged battery compartment, offering longer battery tubes than the Crane and more space around the sides, allowing for larger LiPo batteries to be installed. If you want a longer-lasting battery and your AR AEG has a buffer tube, this is the stock for you!