Mine has been back to Benelli twice now, and with a new BCG the charging handle is still not tight, and is free to rotate about 30 degrees. Better than before, but still not snug as probably intended.
Prior to sending in, I had replaced the charging handle, detent, spring and detent with the same results.
I think that the recess in bolt body has been drilled too shallow...and is preventing the detent from extending far enough out to engage the charging handle with full-time spring pressure.
Edit: Aside from that pesky charging handle, I love this gun.
*Shout out to StrangerDanger for positing up so much useful info. His post on replacing the receiver extension gave me the confidence to take it on. Thank you!