FN 15 Tactical II: https://fnamerica.com/products/rifle...5-tactical-ii/
DD M4V7: https://danieldefense.com/firearms/c...bine-v7tm.html
Colt CCU: http://www.colt.com/Catalog/Rifles/C...t-Unit-Carbine
Sionics Patrol Rifle Three XL: http://sionicsweaponsystems.com/stor...ol-ssk-15.html
Centurion Arms Recce Upper: https://www.centurionarms.com/product-p/recceupper.htm
Centurion Arms CM4 Upper: https://www.centurionarms.com/product-p/cm4upper.htm
Lowers aren't too hard to fill out. I personally assembled all my own lowers, and had Dave Laubert over at Defensive Creations (http://www.defensivecreations.com/) build out my DI uppers using parts that I selected.
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