Minimalist AR 15 (PROP / REPLICA) Lower (PART 4)

I'm working on a prop minimalist AR 15 that uses Metal Air-soft parts, it functions just like a normal AR 15 but can be converted to fire .22LR Blanks (Optional) / Prop. This is the forth part, others will follow soon ;)

I have designed this from scratch to make sure that this does not fit any standard AR-15 or real firearm, it has taken me ages to test print several designs, only 3 parts remaining Barrel, Stock & Bolt

Pin Set: https://www.ebay.co.uk/itm/CYMA-Airsoft-Toy-Pin-Set-For-MP5-M