Without seeing the contract all we can do is guess, but the model they got for testing should have been the model they were buying. Why would Sig provide them with test guns that weren't even the same as what they were buying? Was it a bait and switch? See how good these pistols are? You're not getting them.
There is just so much wrong here on
BOTH SIDES. It's all but impossible to ascertain the truth.
1.) Different guns supplied, other than what the customer ordered.
2.) Alleged "bad ammo".
3.) Not even known if the supposed defective ammo was factory loaded, or departmental reloads. (No brand name has been provided. Or lists of ammunition that worked or didn't.)
4.) The manufacturer replacing parts on guns that there was supposedly nothing wrong with. Besides the allegation of using, "bad" ammunition.
5.) One side saying said weapons worked with duty ammunition. The other side saying they didn't.
Unless someone was in the courtroom, or has actual court transcripts that can decide who said what, this is all but impossible to decipher with any accuracy. Let alone place accurate blame.