With the SBRs and PDW-style airsoft guns getting to be the rage these days, the issue about the battery compartments need to be answered. With such compact AEGs, where will the battery fit in? The answer is in the stock which sometimes offers just some space to fit a small battery in. But some realise the need for a stock can carry bigger capacity magazines. APS show you their CRS stock which looks like it is generous enough to allow you to insert a bigger battery.