This is the first AR that I built both the upper and lower. I tried to pick high quality parts to result in a reliable and KISS (in my opinion) defensive weapon.
Upper Specs:
Noveske MUR receiver
BCM 11.5 ELW Barrel
BCM Ion Bond BCG
BCM Ambi charging handle
KAC URX4 10.75 MLok Rail
Noveske gas block, BCM gas tube, A2 FH
Lower Specs:
Noveske Gen1 receiver
KAC trigger guard
Vltor A5SR RE, A5H2 buffer, Vltor rifle spring
Noveske endplate
Norgon
BAD ASS safety selector
ALG QMS
BCM mod 0 grip, B5 bravo stock
All other lower parts are colt
Other:
KAC 300m rear BUIS
DD fixed front BUIS
Surefire X300 in exo mount
Aimpoint T1 2moa, Larue 660, IO Cover, KAC battery cap
BFG vickers sling with sewn in QDs
Pics of build
I used a BEV block in a hitch mounted vice to assemble the upper.
This lower originally had a basic BCM 11.5 upper on it (the upper with MOE handguards in the photo above). I SBRd a second lower right before 41p with the intentions of building a MK18 clone. I was going to buy a 6920 upper and chop it to 10.3 but decided to build a second 11.5 upper instead.
I shoot rifle left handed so ambi controls are utilized on all of my rifles. I have standardized on BAD safeties, norgon mag releases, and BCM A44 charging handles. I had the DD front sight/ x300 combo on a 13.5" rail on another rifle and felt it was too far forward, it's perfect on the 10.75 rail.
The URX4 was chosen for multiple reasons, the 10.75" length puts the end of the rail right at the back of the flash hider, the integrated barrel nut design results in essentially a monolithic upper, plus I really like KAC rails. The install is pretty straight forward, it clocked like it was supposed to with the shims specified. The two quirks are that the gas block installation is difficult since it has to install after the rail, the rear set screw wasn't accessible through the mlok slot but I was barely able to get it with a ball end Allen key. The second issue is that you can't use barrel blocks to install the flash hider, I was nervous tightening the A2 with crush washer using the Bev block but had no issues.
The ELW barrel was chosen for the optimum lightweight profile, the noveske gas block was chosen over BCM because of its smaller profile.
The MUR upper and ion bond BCG were "why not" upgrades. They didn't add much additional cost but theoretically are upgrades. I chose the Noveske MUR over the standard MUR since I am running a Noveske lower and because it has extra meat at the front of the receiver, since the URX4 doesn't have anti rotation tabs there's no interference issue and I think the combo looks better aesthetically.
I think most of the other parts I chose are pretty self explanatory, I went with proven components and nothing exotic. The gun shoots great and I am really happy with it.
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