Henry Big Boy Steel Carbine 327 Federal Mag Lever-Action Rifle for sale. The 2015 success of the Big Boy Steel model led to the 2016 introduction of the Big Boy Steel Carbine, in 327 Federal Mag, with the same blued frame and round barrel, this time in 16.5” length. It comes with Henry’s glove-friendly oversized lever, and a seven-round magazine capacity. Nearly a half-pound lighter, and with an overall length of 34”, this is one trim partner to your favorite revolver, and it’s a great compact trailgun on its own.