Ok lets see
$450 ish for 15-22
$350 ish for Slide fire
$180 ish for Timney trigger
$25 for KNS pins (or $10 for other captured Pins)
$1005 dollars
for some of the most FUN i have had with a TOY....
Its not for everyone.... and YES all slide fire info says it dosent work... But MANY people have success with upgraded Triggers and SOME just $10 springs and Trigger modifications... so then deduct over $200 from my List
what this SLIDE FIRE did do for me............ is MADE me get a M&P Ar15 Sport.... so add another $650 to the above list
Stav