The #1 expense of a Perazzi is the locking bolt.. If you hold the top lever back.. and do not slam the gun shut..but close it.. and use your thumb to close the top lever.. It will last a very long time... The cost of replacing the bolt is about $300.. Somewhere about 250,000 rounds.. if you take care of your Perazzi.. the ears on the barrel will wear to a point they need to be rewelded.. That's another $150 plus a locking bolt to put you back to as the gun left the factory.. The #121 top lever return spring should be changed every 15,000/20.000 rounds.. $6.00 plus labor.. Normally done for the annual inspection $47.50 at the GRAND last year.. The firing pin springs will need changing now and then.. $6.00 each.. also done at the same time..
You'll need a new firing pin now and then $40.00 each but they usually live a long time.. The trigger will need a tune up about every 50,000 rounds or so.. $75.00 at Giacomo's.. A leaf spring for the hammers..$45.00 The average shooter might change 1 per year.. The bridal for the spring and the cross pin will need to be changed about every 100,000/125,000 rounds $45.00 each..
Forend catch bolt will need changing about every 100,000 rounds $32.. and the catch bolt spring every 200,000 but at under $20 might as well change them both..
All in all.. IF you keep your gun clean.. and lube properly..if you figure over the life of the gun $125.00 a year I think you'll be real close.. And your Perazzi will stay in top shape..
Any Perazzi well maintained should have a cheap to keep life of well over 500,000 rounds.. The big rebuild is new hinge pins..weld up barrel ears.. new locking bolt..refit barrel.. reblue.. refinish stock..The gun will be returned to you like new.. That runs about $1000.. but few shooters ever keep a gun that long..
95% of the Perazzi shooters will never break a top lever... BUT.. if you do.. it's over $350 to replace and fit.. This is pretty much the menu for money.. give or take a few dollars..
Remember.. in a Perazzi.. the locking bolt is the sacrificial part.. It's made to wear.. and be softer than the mono-block.. You WANT.. it to wear.. rather than the barrel ears.. BUT.. properly closing the gun can greatly extend its life.. All Good.. Mike