Don't get a LiPo if your not 100% comfortable with it, there's alot of reading involved.
G&P crane stocks are great, their 8.4v 2200mah batteries are fantastic. But solder a new deans connector on yourself, 7/10 batteries I've seen have had cold solders on the connectors.
But 2200mah will last you around 30 68-round mags or so
Biggest Lipo you can get in a buffer tube is pretty small, under 1500mah I think, then you need a protection board as well, 100$ charger, 20$ lipo charging sack
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