So christmas is rapidly approaching and the wife has demanded a list. I've been looking for a cqb gun lately, and blah blah blah, I've narrowed it down to these 2. I know the xcr is a split gearbox with nonstandard v2 parts but I don't know what's different. What's compatible between the xcr and a regular v2 mech box? Additionally, what kind of battery styles does the xcr have? Does the pdw have any other battery options other than a peq? Do you have personal experience with both these guns? Are there any other high end pdw/rdw armalite type guns I may have over looked? I'm not looking for soul crushing performance, but great looking and feeling externals are paramount.