Collins' Pistol...
John Norman Collins was said to have possessed a .22 handgun - most likely a revolver, although one was never found by investigators. What was found in Collins's belongings were 175 rounds of Remington .22 ammunition. This would have been three and a half boxes worth (50 rounds each).
Andrew Manuel claimed that he stole a pistol, along with some rifles and shotguns from Collins just prior to his (Manuel's) fleeing Michigan in July 1969. Collins had stolen the rifles and shotguns from fraternity brothers earlier. Those were recovered by police, but not the pistol - which Manuel claimed to have not sold, but rather disposed of when he was enroute to California by bus. He was vague as to what he actually did with it, and could not or would not state what make and model the pistol was.
Collins claimed that Arnold Davis disposed of his .22 pistol, taken from the glovebox of Collins' Oldsmobile after they had done some target shooting with it.
Both Jane Mixer and Alice Kalom were shot in the head with a .22 pistol. Spent bullets were recovered as evidence. One news report stated that the weapon was a Hi Standard revolver.
Because Karen Sue Beineman was killed by strangulation and by trauma from being beaten with a blunt object - rather than by firearm or knife, Collins' hunting knife and the .22 ammunition were not entered into evidence during his trial for her murder. It was the prosecution's conscious and careful effort to keep all other murders separate from the Beineman case during the trial.
As with so many elements of the Coed murders case, it is largely circumstantial evidence which connects Collins to them.
One has to wonder what really became of his pistol (for which he clearly had ammunition). And one also has to wonder why he had so carefully cleaned his hunting knife of all fingerprints and any blood - after taking it from under the seat of his motorcycle and before placing it in Arnold Davis' dresser drawer.
Collins also carefully cleaned his stolen camping trailer and Oldsmobile of ALL fingerprints. And he carefully cleaned the Leik basement - making a special effort to paint over what he thought were blood stains. Was he simply a person obsessed with cleanliness - or was he intentionally destroying evidence which could connect him to murders?