I'm a big fan of buttstock stowage of cleaning items in rifles that allow it, particularly if said rifle has any possibility that it could be used in a "SHTF" event. However, I wasn't thinking in those terms back when I got my AR carbine (with standard pistol grip). IMO, lube is about the most important thing to keep one running happy - so I'd settle just for a way to keep some oil/CLP on board somehow. I thought a small eyedrop bottle was just the ticket, but it's too fat to fit the grip. I feel like there must be SOMETHING out there that would work, and I'm just overlooking it... The Otis CLP tubes just about fit with some compression, but are just a tad too long (not even counting that a grip plug will lessen the storage space even more). Otis makes a grip cleaning kit, but I don't see any provision for lube at all.... I've seen advertised a grip kit with assorted tools plus what looks to be a very SMALL ampule for oil. Quite pricy and better than no extra lube at all, but... I know there are a bazillion aftermarket grips out there, but without being able to see and inspect one up close, no way of telling how much storage space they offer. I actually remember seeing a carbine buttstock advertised in Cheaper than Dirt that boasts "a huge storage compartment." Again, would really like to be able to see it up close - especially at the price! Something else I've thought about was maybe a pouch that attached to the buttstock by velcro. I see magazine pouches at lots of places, but they're not fully closed. But I've also seen zippered pouches.