I got my XBRN177E2 upper from Brownells Thursday. It was $100 off during the last big sale, which I think is still going on. I got the 1:7" twist barrel rather than the 1:12". I don't plan on shooting 77 grain match bullets or any other long for caliber bullets out of it. I have some but they're for my 20" AR. I'm just too lazy to figure out what the velocity of the 55 and 62 grain bullets I plan on using would be from the 12.7" barrel, converting that into RPMs, and seeing if I can find someplace online that says that's fast enough to stabilize them. If they had a 1:9" twist option I would have just bought that and hoped for the best.
The "moderator" is pinned and welded, and they didn't bother to put a dab of paint over what looks like a lump of copper-based brazing. My guess is that it's a brass alloy of some kind. Since I'm putting the the upper on my old Colt AR I got a new Colt-made conversion pivot pin. This looks better that the old one I used when I only had one lower. The old one doesn't have a head on it and goes down inside the lower when you tighten it. If my lower had a fence on it instead of being a slab-side, it looks like the flat side of the head would be against the end of the fence where a normal pivot pin should be, and keep the pin from rotating when I open and close the receivers.
Colt decided to go with an 11.5" barrel and longer muzzle device on their XM177E2 reproduction. By now I thought someone would have split the difference and used a 12" barrel with a muzzle device between the size of the original and mine. IMO it would be harder to tell at a glance that it was 1/2" longer than it should be, rather than one part being 1.7" longer. But you pay your money and take what you get. The Colt really looks good but even if they weren't sold out I couldn't afford it.
Now I need to decide if I want a Right Side Folding Stock Adaptor or Left Side Folding Stock Adaptor from Deadfoot Arms. The right hand adaptor is in stock now but not the left. I can stick my M4 stock on it and have the ability to shoot with the stock folded, and forget about buying the BRN-180 upper and a stock adaptor. I already know the M16/AR-15 system inside and out, and unlike the BRN-180, spare parts are not only available for it but are abundant. I get a 20% discount at Deadfoot Arms for being a veteran, and I can save $100 off the folding stock adaptor kit by sending in my bolt carrier for them to modify, instead of buying another one in the kit. The right-hand folder would probably work best for me slinging it on my right shoulder and it's 10 bucks cheaper than the left-hand folder. I think I talked myself into it. There goes anything I had left of my $1,200 "Trump Bucks" and then some.
https://deadfootarms.com/products/modified-cycle-system-folding-stock-adaptor-black-nitride-bolt-carrier-group/ ANY UNITED STATES VETERAN AND ALL ACTIVELY SERVING MILITARY PERSONNEL ARE ELIGIBLE FOR A LIFETIME 20% DISCOUNT ON DEAD FOOT ARMS PRODUCTS. WE THANK YOU FOR YOUR SERVICE TO OUR GREAT NATION AND APPRECIATE THE SACRIFICES YOU AND YOUR FAMILIES HAVE MADE IN THE NAME OF FREEDOM. You just need to submit a redacted copy of your DD214 and you're set for life. The main thing they want to see is your name. It's not like id.me where they want to see
everything, which got me a 25% discount on the already sale-priced Carhartt stuff that I'm
still waiting for.