The PTS Enhanced Polymer Stock (EPS)is a full-function collapsible polymer stock that offers the user lots of flexibility in how to utilize it. Like all the other PTS polymer products, it is manufactured with authentic Dupont™Zytel® polymer for superior wear and damage resistance as well as durability. The PTS EPS features a rubberized removable butt pad for comfort and a slip-resistant grip. Fixed-side storage compartments offer enhanced comfort and a consistent cheek weld. The side storage compartments measure up to 139 x 31 mm of spacing so you can fit 2 piece butterfly style 2/3A cell NiMH batteries or Lipo batteries to power your electric airsoft gun or you can use the compartments for AA, AAA, CR123Abattery or miscellaneous parts storage. Additionally, the rear portion of the stock can fit a 9.6V NiMH min ibattery or a LiPo battery of similar size as well as be used for miscellaneous storage. There are multiple sling mounting options featured on the stock including QD swivel sockets on both sides with a pass-through channel for loop-type sling attachments and a sling slot on the front side of the butt part of the stock. The EPS Stock is compatible with almost all AEG and GBBR buffertubes