Here’s a unique upper for your AR-15, Tac-15 builds crossbow uppers that attach right onto your AR-15 lower. While it’s not new, I recently stumbled upon it while researching for a new AR upper. Tac-15 claims their crossbow uppers are the most accurate and powerful crossbow on the market. They currently have four models available, check them out at Tac15.com.
While Daryl’s Crossbow in The Walking Dead isn’t as sweet as the one above,the Tac 15 crossbow would make a great silent zombie slayer.