Guns N' Roses - or at least some of them - are currently rehearsing in L.A. That much we know thanks to Duff McKagan, who posted as much on his Twitter. He also posted a couple of photos, though no members of the band are actually shown. Another tidbit came out via an endorsement deal. According to Musical Instrument Professional, "Rotosound chairman Jason How and his wife Kathy were personally invited by the band to attend their rehearsals in Los Angeles to meet McKagan and spent time chatting with him about a new collaboration with the iconic British string manufacturer." Rotosound likely won't be the only equipment company looking to hop on the Guns N' Roses bandwagon, but in any case, it's another confirmation that the band are in rehearsals - though whether or not that includes lead singer Axl Rose, who has been known to duck rehearsal duties, is anyone's guess.