I would wonder about your market. I know in the states we have a different relationship with guns and of course here in Texas you are very unusual if you don't have at least one. That being said the bolt action is my best seller. I only make a couple of small town shows a month. But, of 85 sales so far this year, 28 of them were bolt action and 18 were various slimeline pens.
Besides, with a bolt action pen you only turn one piece and press 3 parts together and you have a quality product.
Old Corky
From Pine Island, Texas