If you are going to the trouble of shooting with a hammer gun then get something that is nice - not some plain nail with thick barrels that handles like a scaffolding pole - something with character - that handles as though it knows what to do - at least 100 years old - that you will be proud to be custodian of for your life time, admiring the skill of the men who lovingly crafted it by hand, under oil lamp light - Oh I am getting a bit too sentimental and nostalgic here so here are a couple of photos to wet your appetite at what you could look after at a reasonable price. As you have heard many times before "life is far too short to shoot with an ugly gun!"
John