Building an AR-15 upper receiver with the following components.
BCM BFH 14.5″ mid-length barrel
Knight’s Armament URX III Rail
Rainier mil-spec upper receiver
BCM BCG
BCM charging handle
Knight’s Armament Micro Rear sight
Rainier Upper Receiver parts kit
Using take down pins to secure the upper receiver while torqueing the barrel nut is a good way to ruin your upper receiver or break off a take down lug.
Damn knipex, THIS GUY FUCKS.
I figured you would put the barrel in before screwing the rail on.?
Sorry I'm late to the party.. I'm building an upper using this URX rail… I'm going with a DD barrel which comes with a pinned gas lo pro gas block. Any issues with yours and your gas block?
What happens to that blue lock tight when you get that barrel cherry red from running several mags through it?
how the rail holding up?
Nice Job bro….I used AS 33MS on the barrel/upper receiver interface and Rocksett in the barrel nut/rail interface. For support I didn't have a carry handle and improvised with scope rings and aluminum barstock.
BTW ….Like your Sunnto Core Watch.
I would use aeroshell on the barrel nut, but thats just me. Nice build man!
my dad uses the same pliers you have.
torque wrench should be at 90 degrees, to get a proper reading.
Nice video! My upper build is almost a twin of yours. I used an aero precision upper, KAC URX 3.1, Daniel Defense 14.5 CHF mid length barrel and a surefire mb 556k. The only part I didn't think ahead about was my gas block. I used a Daniel defense MK12 gas block and I had to shave down the bottom of it so it would clear the rail. My upper runs like a champ.
I've always wondered how to install a URX.
Great video.
Great improvising with the carry handle! Lol.
Good video, not very many out there for the KAC rails. I just put a very similar upper together 13.5 URX 3.1 and 14.5 mid length Daniel Defense barrel, pinned and welded a Surefire flash hider so I can run it suppressed. Best and softest shooting shooting upper I own
what kinda wrench is that?
Very clean video man. You did a good job with the camera angles as well as keeping it very to the point. Very professional video man. I would recommend reading the Army's M4 Armorers Manual TM 9-1005-319-23&P. You did back off the barrel nut once so that was better than nothing.TM 9-1005-319-23&P 3-10 Section D recommends that you condition the threads 3 times. It helps keep it from backing off. Loctite is not usually needed but I understand why you used it on the URX rail. Keep up the good work! There are too many crappy armorers videos so it's nice to see a well filmed one like yours.
Thank you very much.
Great video! I love my URX rail. Thanks for sharing.