I don't know much about CBC but if somone wanted a plastic part like pictured above made of metal would it be possible if they were sent the plastic version ??

If that's a serialized gun receiver, whoever makes the part for you needs to be a licensed gun manufacturer, or you need to be physically present and do all the actual work under someone's guidance. Stupid, but that's how it works.

We its an air rifle reciver,,does it fall under the same rules ?

No rules for air guns, so you should be good to go. As far as making one, I can't help you there.

Would absolutely be possible, but probably pricier than you would think.
If you could find somebody to draw that part in AutoCAD it could be easily machined from aluminum billet.

If you just need replaced and not concerned that it is plastic maybe find a nerd with a 3D printer?

The great benefit of Computer Numerically Controlled machining is the capability to speed production. If only one part was needed a manual machinist would be cheaper and probably do a better job of it.
The price to make that part would be more than I bet you think. There are many setups involved.

CNC would be done with that in a couple hours. But it would take a couple days to create the model file. Just a really rough ballpark number would be $1500 based on $100/hour shop and engineering rate.

I'm kind of surprised you haven't tried making one out of duct tape, Bondo, and scrap metal yet...
But I think a lot of machine shop could do it for you. Manual or cnc, doesn't matter. CNC's main advantage is mass production, so for a one off part you'll be just as well off with a good manual machinist.

This is not 100% correct. It's a grey area. If someone helps you make a firearm receiver, even giving guidance, the ATF can say that you (the person giving guidance) was also the manufacturer. If they would decide to push that issue, be sure that you would probably get a room at club fed since they have all the money in the world to make an example of you.

I have been a CNC programmer/machinest for 30 plus years. I can tell you this, to make one of them would be extremely expensive. The benefit of CNC machining is quantity. The more you make the cheaper it becomes.

There are a whole bunch of radiuses on those parts. That makes it a bear to cave out of a bit of billet with manual machines. Whatever route you take making those parts, you would be better of buying an arm full of new air rifles and still have money left over for a good night out.

It could be done on a manual mill but it would take forever and be a nightmare. DRO would help but it still wouldn't be any fun at all. It would be easier to program the CAD file yourself (if you had the software and knowhow) put it on a chip and give it to someone with a CNC mill. It just might be a realistic expense then but still way to much for a BB gun.

You can make that out of some mild steel. It wouldn't be the exact shape on the outside, but you could definitely make a receiver to hold the internals properly out of about $5 worth of parts. All you would need for sure is a drill press and caliper, but a welder of any type would make it easier to tack little nuts inside so you could easily screw it together and put on a trigger guard. Those parts are not as complicated as they look, but definitely too time consuming to pay a shop to produce.

We could blue light scan that and make an exact replica in CAD fairly fast. The actual milling and getting all the rolling selected and what not would be a pain. Let’s just say the price would be more than a fairly high end real rifle...

What is a blue light scan? Sounds like what they used to have going on at Kmart.

Just my two cents check your local edm shop chances they do mold work . The older the shop the better.
Most have tracers for their mills , simply stated it will run a. Stylus across your part while the mill cuts your new metal one . This would be your cheapest route if you choose metal

We have a laser scanner that could make a cad file/ part model for that in no time at all, the machining is a different story though.

Would a laser scanner or a blue light scanner be able to scan the interior of the receiver to get measurements for the bore and the cavity that the bolt sits in, or the chamber where the bbs are stored??

this is how it works........

https://www.youtube.com/watch?v=q3SVTBrKyZk

Sure, it would be possible.

In the machine shop where I work, making one piece would easily be $3,000 - $5,000. Probably more. Serious technology and talent cost serious money.

And, if you don't have a print including tolerances, there's no guarantee that your metal copy would even fit together with the rest of the mating parts.