[doorgunner69]

BB = inaccurate.

If you are series, ought to look at one of the high pressure air pellet repeaters like the Marauder or Hatsan 44.

[Kevmo]

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRiVsxzTpXh1YHY97Ag5aFg7cnHigyb6nbxy3Yjy2OgyznA0D_a

[Sgt_Schultze]

Why do you wanna do that? He’ll shoot his eye out.

[Kirkwood]

Kind of hard to find something for under $100.
http://www.pyramydair.com/s/m/Winchester_M14_CO2_Air_Rifle/2719

[Utilizer]

Agree with post #2: BB = good for balloon popping and not much else. Pellets get you much more accuracy but you are not going to make any long-distance accuracy shots with what you are asking for.

Best bet: paintball gun. For BB's and .177 cal pellets Crosman is a much much better choice, and .22 works even better. For a repeater, forget it. Daisy is junk, but for accuracy practice, look for foreign manufacturors for the best choice. A name like Feinwerkerbaugh among others (breakbarrel / spring) were much spoken of in years past, and Sherman Arms was no slouch either. Not certain what is out there now, but your request as it stands is a pipe dream.

[Rodamala]

Does it need to have a compass in the stock and this thing that tells time?

[Slings and Arrows]

You’d be much better off with a spring-piston pellet gun. Power and accuracy will be much higher, and with a single-shot you learn to make every shot count.

[fulltlt]

"We will be installing a TV remote motion sensing target system for critters in the back yard and... because... it's a fun project. But that precludes pump action, needs to be CO2 powered. "

This seems to be a rather not well thought out project to put it mildly. What happens when the neighbors cat or kid wanders in? What are the goals of this project? Getting rid of pests? If so there are much better ways. No matter how well designed your Rube-Goldberg would be you could never guarantee a clean kill. I would hate to have an animal only wounded by your contraption. That's not humane.

[Jack Hammer]

Blah, blah, blah. The kid wants a BB gun, get him a BB gun:

http://www.airgunsofarizona.com/

Crosman, Daisy, Baikal... whatever. Many under a hundred bucks.

[Caipirabob]

I never had a BB gun. My dad bought me a Crossman .22 Co2 pellet gun. I LOVED THAT THING and it was wicked accurate. They've changed the look only a tiny bit. It was a beautiful weapon.

Crossman rifles (Co2)

[trebb]

This is an intersection of several projects. It needs to be semi-auto with as many rounds as possible available.

Sounds like it will be easy to go through a lot of CO2 cartridges quick. I must be old because I prefer having to cock a BB/pellet gun between shots.

Let us know what you end up with and any insights that come from the project.

[Cheeks]

I’ve got a 1077, and it is not fun to shoot. I bought it b/c it was semi-auto, but the trigger pull is so bad, that it’s not fun to shoot.

You can’t leave a CO2 cartridge in it, or it will start leaking.

And yes, it’s only pellets. It was ok as far as accuracy, and the price was great. ~60 on Amazon.

[Jack Hydrazine]

You should go full-auto for the BBs and single shot for the pellets.

Do you want him to learn to shoot accurately?

[MrB]

Get the 1077.

It’s a CO2 .177 pellet repeater
that is enough of a replica of the Ruger 10/22
that he could step into the 10/22 and not even notice...
(to a certain extent)

[TexasRepublic]

“We intend to replace the stock with a wooden one that he’ll make in his woodshop class.”

Unless your son is home schooled, that may cause a major provocation at school. Some schools are busting kids for merely drawing a picture of a gun.

[sarcasm]And horrors, you want to make part of a gun at school? Are you crazy?[/sarcasm]