It looks to me like a short strap with the buckle on the end.The pistol grip behind the Glock's grip is kind of weird...
But even in the USA I would rather get this kit instead of a Marlin Camp, Ruger PC or Beretta 9mm carbine. For one its the trusty Glock 9mm thats at work here, no need for other magazines (Glocks 33rds!) or spare parts, its far more compact and has lots of rail space.
seriously, Glocks needs a real Carbine inn both, a Pistol Caliber and Rifle Caliber if they want to keep there Dominance of the LEO market.