model 1 has a square ejection port and a shorter barrel as well as a hand lapped action
model 2 oval ejection port longer barrel better trigger. not hand lapped action
model 5 is a model 2 action with a model 1 barrel
unsure about model 4s
within this there are differences in rifling of the barrels some have 5 or six grouves and others have 10 or 12
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