First I would need the model you have. I will then determine how the model needs to be split to fit the printer if at all.
Then the dimension of the pellet gun so I can hollow out the model for the gun to fit. The measurements need to be as accurate as possible. Typically I recommend you use a digital caliper, but if you don't have one and don't want to buy one I can work with you to get as close as possible with what you have. They sell them at Harbor Freight for $20. Occationally they offer 20% off coupons.
Please measure everything in mm to the nearest tenth, not inches.
When I printed parts for Boochman we did a video chat so I could walk him through the process and we didn't miss anything.
Moving forward we should chat via PM so we don't bore everyone to death with every little detail.