Excellent- spendy, but recommended - Geissele Usasoc AR15/M4/M16, 5.56mm, 10.3 inch Upper Receiver

An upper worthy for the Boog. Superior fit and finish. Handles well in tight quarters/cqb environment- pair with an SB Tactical brace to avoid ATF NFA nonsense- I recommend the SBA3, as the cheekweld is closer to the SOPMOD stocks, as the cloners know. Is this a true clone? No. However, I have found the Geissele parts (upper reciever/super gas block) a better fit for this upper vs a true clone. The DD MK12 gas block may have potential clearance issues with the MK16 rail, whereas Geissele’s super gas block is more forgiving. Bombproof installation sums it up, with a pin and two set screws (witness marked) on the gas block. I spotted some aeroshell grease under the barrel nut- I am confident the builders at Geissele know WTF they’re doing and have strong QC in place. Cloners will drool over the rare SF4P flash hider, and may even pay you $300 for it. Upper came packaged in a URG-I box with the Surefire “golden ticket”, a Super 42 H3 buffer/spring, and a 35% off Geissle.com coupon (Geissele has been hit hard for product demand since Black Friday 2019, and wait times have been months for some- this coupon is likely a limited time customer apology). You will spend about a half hour cleaning the cosmojizz off this upper and BCG. Bottom line, if you have the coin, want this upper, and find this upper in stock (rare)- get some!

This upper should suppress well (DD has reduced MK18 gas port to 0.070 since 2017) and will love to eat 77gr. Will look into the Surefire Warden attachment if the upper is too blasty.