Five Star Gift Ideas

Finding a thoughtful gift for your grandpa, incorporating his interests in engineering, problem-solving, guns, Star Trek, and Harry Potter can be a truly rewarding experience. Here are some gift ideas that may resonate with him:

1. **Engineering and Problem Solving Kits**: Consider gifting him an advanced engineering kit such as a mechanical puzzle or a 3D wooden puzzle that requires assembly. Companies like UGEARS and ROKR offer intricate wooden models that come in the form of working mechanical clocks or miniature vehicles, which could appeal to his engineering and problem-solving interests.

2. **Custom Harry Potter or Star Trek Memorabilia**: Since he loves Harry Potter and Star Trek, look for high-quality collectibles like a replica wand or a model of the Starship Enterprise. Alternatively, consider a custom-framed print of his favorite quote or scene from either series, something that captures the magic or adventurous spirit he admires.

3. **Gun Enthusiast Gifts**: For his interest in guns, consider visiting a specialty store to find a unique piece of gun history, such as a historical book detailing the evolution of firearms technology. If he's someone who enjoys hands-on projects, a DIY gun-building kit where legal, respecting all local laws and regulations, could be a unique and engaging gift.

4. **Mind-Challenging Books**: Books that challenge the mind or provide insights into engineering marvels would be ideal. A book detailing the engineering feats in space travel and technology, such as "NASA: The Complete Illustrated History," could blend his interest in engineering and space exploration within the Star Trek theme.

5. **Customized Experience**: If he's someone who enjoys interactive experiences, you might look into classes or experiences related to his interests. Maybe there's an engineering workshop, a Star Trek experience at a local sci-fi exhibition, or a Harry Potter universe event happening nearby.

6. **Personalized Accessories**: A personalized item like a leather-bound notebook or a pen, embossed with a starship or Hogwarts crest, could add a personal touch. Not only is it functional, but it also pays homage to his favorite series.

7. **Subscription Services**: Gift him a subscription box related to his interests. There are boxes for gun enthusiasts that provide unique gadgets or history-focused memorabilia, sci-fi boxes featuring Star Trek themes, or book subscriptions that could occasionally feature engineering-related topics or novels.

Combining elements of his varied interests into one comprehensive gift, or a themed gift bundle, will surely feel special and thoughtful.

Or you can get him a star map with the date when he was born.