Complete OEM Glock 20 G20 upper slide assembly 10mm barrel. -SPF
This and a magazine (not included) will turn your G21 lower into a a G20 10mm.
Looks to be in great shape. I've never fired it. I purchased it for a family member who decided to stay with the G21.
$295 to your door any where that a USPS SFRB goes.
Payment by money order, personal check if we've dealt with each other before (I'll wait for clear), or paypal.
First "I'll take it" with PM.