I have a Parker 10mm with a 3 3/8 barrel.  I shoot it often and have rarely, perhaps twice, had a malfunction.  Both were due to the ammo.  The Parkers were made for a full house load and require real 10mm loading to function.  My pistol is extremely accurate.  Contrary to what is common reasoning the longer Parkers have more friction and are more likely jam.  There are a couple of odd aspects to this pistol.  One is that when you take off the slide parts fly out.  The other is that on my pistol it is possible to resemble the pistol without the locking pin in the link.  The Parker is a rare pistol from a time when a pistol that wouldn't rust was a good thing.  Mine has been accurate and reliable and feels right in my hand.  It has been a great shooter in 10mm for the money.