This is a Pws mk109 pro upper pistol chambered in 300 blackout piston driven 9.75 with a 3 point adjustable gas block on a santan tactical sbtt15 full ambidextrous lower ,has bcm grip bcm handstop and sb tactical hbpdw brace , comes with eotech xps2 300 blkout version magpul flip up sights 2 point sling 1 20rd lancer mag and 1 30 rd magpul mag I am missing some things but it’s my favorite 300 suppressed or not . eotech is rattle canned and so is the brace