Project Appleseed

Great for backyard shooting.

Accurate
No problems shooting scaled 50 ft AQT (from 50')
I shot three rounds Stage 1, 3 and 4 and all were 5's

Quiet
Out of a 20" Barrel they are a little louder than my Gas Blowback airsoft pistol.
Can shoot them indoors without hearing protection.
Out of a Pistol they are  louder

THEY ARE STILL REAL BULLETS
Average penetration was 260 pages in a phone book and still cut the paper through another 50 pages or so.
If you live in a small town, it might go all the way through!

Function
Won't cycle the action on a semi.
You have to manually eject/cycle.
My AR won't extract them.  Sometimes they will fall out...I usually have to pull them out with my fingernail.
My Glock .22 conversion won't even chamber them consistently (they are shorter than a real 'long').

The price runs about $5 for 50 or $8 for 100

CCI makes 22 CB Longs which also work fairly well.

They still won't function a semi-auto, and some rifles don't like to feed them.

That said, they are quiet and work. My Winchester 190 (tube fed semi) loves them, just have to work the bolt for it.