I'm not going to quote everyone here, but there is some clarification that needs to be made.
1301 series is based on the A391 Xtrema shotgun operating system, which has been on the market for over 15 years. The gun is very well sorted.
1301 Tac has a 3" short receiver, and will continue to have one for the forseeable future. With that receiver and judicious stock choice, you can achieve nearly SBS size with a full length barrel.
1301 Comp has a 3.5" long receiver, and will continue to have one for the forseeable future. The barrel however is also chambered in 3" rather than 3.5". This is to allow for easier manipulations of shells in competition use.
The Comp retains the first gen bolt release for the time being, although I have requested that we implement the Gen 2 Tac bolt release in that. For now, if you are concerned about shell dumping in competition, you can use one of these:
https://www.berettausa.com/en-us/ber...d-kit/eu00074/ (made available with thanks to Tom Jones).