DDirtbike Anyone ever seen one or used one on an SL9? For $575 they are fairly in line with price for a good quality rear charge blowback upper. My only concern would be the clearance on the buffer tower but since this doesn't use a buffer or tube I could probably trim that off before printing. Also seen some buffer thread to pic rail adapter print files floating around. https://matadorarms.com/product/mat-9-9mm-ar-rollerdelayed-upper/
undeadchew DDirtbike I designed a lower for you to try out with the Matador 9mm upper. Reference picture: Reverse engineered design: Rear takedown detent hole requires a spring to be cut down (cut off around 10mm) and uses the extra grub screw that comes in Hoffman's kits; Plate Upgrade, SL9-Kit otherwise up to 10mm in length #10/32 grub screws can be used. Download Link: SL9-Matador-Lower
