A few questions please. Are the barrels interchangeable with any other model Perazzi? Did the gun come with choke tubes or is this aftermarket? And is the butt stock interchangeable with any other model perazzi?
The Barrels are Type IV and are interchangeable or compatible with any square mono bloc receiver. The GA1 came with Generation 1 Chokes and from looking at the pictures I would say they are original to the gun. You will also see in the pictures a set of Wrights Chokes, which are after market but use the same thread pattern and are an excellent choke. As for the stock, yes it will interchange with any perazzi removable trigger receiver. Lastly, remember with all perazzi parts there may be some fitting required.