Geez guys,

Guess my last air gun was just a toy...
We had a pumpmaster 760 by crossman growing up. Cost around $30- $40 I think, We couldnt afford the fancy stuff ) and we did it open sight.. dont know about birds or chipmunks and such, we didnt shoot that sort a thing past 30 or 40 yards, but only cause it was open sighted. BUT my mother used it as pest control, to rid the farm of stray dogs that might want to chase the stock, she could control the power enuff to zap em hard enuff to chase em away without hurting em, She zapped big old dogs out as far as 100 yards. ( course my mom could hit anything she wanted, mever saw anyone as good as she used to be )

Just my uneducated opinion!
Terry