MX 8 and MX 2000....have flat (leaf) springs....but can be special ordered w/ coil springs....w/ drop out triggers, selectable or not....selector down by trigger.
MX 12 and MX 2000s are coil spring guns w/out the drop-out trigger group.The selector is on the safety similar to a Beretta.
SC1 or Comp 1--built for Materelli for the 64 Tokyo Olympics...he won gold in Trap.
MX 8--built for Materelli for the 68
Olympics in Mexico City(thus MX 8].
MX 2000 --built to be intro'ed for 2000 Oylmpics in Sydney.
--no longer made but an upgraded version of all of the above.
ALl these guns can be had w/ fixed chokes or factory chokes.
Perazzi makes the following bores....> .724, .729,.735 and .740. All can be had w/ factory cchokes except the .740.
OR you could get a K80....