Building upon what I've learned after making a custom bull pup SMG receiver for my friend Guyver94 I took that old receiver and in my opinion made it better.
I have two versions. Top: is the standard receiver with a hand guard. Bottom: Is one with an added rail as suggested by Chalk433.
Both are available here to use (Credit must be given if used) Standard [link] With Rail [link]
I added an integrated front flip up sight and a top rail.The reason the front sight is standard and not removable is because the rear sight is the only one that is adjusted and removable for use of optics.The mag well is easily modified for a larger mag if wanted.I will make a custom trigger guard later on.
Tell me what you think,any critique no matter how small is appreciated.