Well you're going to see me spending more of it...I figured out the issue with this build...with the help of Gilliebear over at Hkpro. This is a MP5 receiver! Not a MP5K....arg looks like I'm building it first...hahaha
So now I need a cocking tube barrel, trunion ect...oh boy fun. I feel like a complete dumbass for not figuring this out before!