+1 with tucker301, i paid in full once for an HK pistol, never did get it, and it was a pain to get the funds back.
Best wishes for a prompt delivery....
PS I have an SL in 20 and love it.
ordered the snap ring pliers noted in the install info, Grainger has the Blackhawk model, and it was a 5 minute job. and yes the ring needs to be expanded to remove.
No issues.
Someone jump in as I am not right a lot anymore:)
As I recall, a shotgun has to have an 18" barrel and an overall length of 26" minimum. Otherwise it is a NFA item.