This is a model for a double bladed longsword. There is a read me file for instructions on how to actual get his to look right. However, I'll say so again here.
To get the actual effect of the double bladed longsword, copy the longsword blueprint. Then under properties for "Model Part 1" choose the number 1, and for "Model Part 2" choose the number 1. The last part can be any that you wish. There you have it!
10 - A Masterpiece, Genuinely Groundbreaking 9 - Outstanding, a Must Have 8 - Excellent, Recommended to Anyone 7 - Very Good, Deserves a Look 6 - Good, Qualified Recommendation 5 - Fair, Solid yet Unremarkable 4 - Some Merit, Requires Improvements 3 - Poor Execution, Potential Unrealized 2 - Very Little Appeal 1 - Not Recommended to Anyone