As far as I am aware the gun performed fine but there were rather big issues when the time came to sign the contract, monetary issues on our side and a reluctance to agree to delivery terms on theirs, PA had a rather bad experience all things considered, but i suppose not all deals go smoothly, its good That the two countries didn’t let it effect other weapons deals, maybe PA will try it again too if the local option needs competitors to go against.
As for HMC. All the gun barrels used in our tanks are from HMC. The same boys made 155MM barrels for M109s before but the quality wasn’t good enough, maybe that’s where the reluctance stemmed from. However I assume they’ve now fixed those issues If the gun is under testing.