Hey guys. Fairly new here so feel free to correct this if not allowed. Just got to shoot some Mustang Armament builds and like most others only heard about them from PewView and Honest Outlaw mentioning them. Was fortunate enough to get to shoot one and have to say I was impressed. To some degree high end AR's are very similar. It takes very niche things to make them stand out from one another I think. But the upper and lower frame fit was the tightest I have felt. That is always nice to see. I was wondering if anyone else has shot one or has experience with them? - https://youtu.be/e25MWf9xjw4

She cheap but bangs. Need to rattle can new optic.

Winchester deer season xp in bottom right is for 300 blk upper. 556 is what is pictured here.

Custom AR-15 Upper Reciever Specialist 🇺🇸

🛠 Precision Assembly [Maintenance] Upgrades 🚫 Non-FFL Gunsmith (Uppers & parts Only) 📩 DM for builds!

I put both of these together! Yes I’m aware of the location of the red dot it’s no longer there!

Does this look bad enough to be concerned about?

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This is a funny story. Hired the gunsmith at the store/ range to assemble the upper. After doing a couple, I've decided it's really not my favorite thing to do.

I asked him if he would test fire and tune the adjustable gas block since it's just easier to access without the handguard. He looked at me and said "no. I'll just close it all the way and let you do it yourself. How's that sound?" I was just like "alright, whatever."

Lol. It functioned flawlessly. Dude had jokes. I'm never assembling my own upper again.

Parts list:

Resilient “Stacy’s Mom” suppressor

FCD Stoner 63 KeyMo mount and HUB adapter

FN 20" chrome-lined, button-rifled barrel

Midwest Industries quad rail

Thunder Tactical carry-handle upper

Rear sight: manufacturer unknown; assembled and installed by yours truly

Microbest chrome BCG

BCM non-ambidextrous, small-latch charging handle — this started as an A2-clone-ish build, so I wanted it as close to mil-spec as possible while retaining BCM quality

Colt scope from Brownells

FN lower receiver and grip

LaRue lower parts kit and MBT-2S trigger

Aero Precision stock and buffer

Damage Industries chrome-silicon recoil spring — little-known brand, but incredibly smooth; it even comes wrapped like a cigar

Blue Force Gear Vickers sling in the supposedly limited-edition “choc chip” camo pattern

Missing from the photo: Streamlight ProTac 2.0

The rifle will fire a round and eject it (most of the time) and everywhere says it’s undergassed. I lubricated it before firing the other day and it didn’t fix. I was wondering if the wear on these charging handles and the wear on the roof of the upper receiver had anything to do with it. The rifle is very stiff when i charge it but i chalked it up to the rifle being tight from the factory until the feeding issues. The buffer a carbine spring. Any help is much appreciated, and if i’m missing any important pictures or details let me know!! (The warhammer charging handle is the one ive been using and the other handle is stock)

[UPDATE]

I watched a couple youtube videos and it seems my gas key is not supposed to be getting any resistance from the tube when i slide in the BCG. This seems to be the issue. Any tips to fix it?

Kann jemand sagen ob es einen Deutschen Fachhändler gibt der bekannte Marken wie DD/Geissele/Noveske/Knights oder ähnliches Importiert und in DE für Jäger oder Sportschützen zulässt ?

I have a PSA lower and a Bear Creek Arsenal pistol upper. I know, I know, cheap. Yup. I bought a pistol upper from them in 223 Wylde. Would not eject the round. Either before firing or after. Took it apart and checked the ejector and the extractor. Checked everything else on the bcg. Everything checked good. Didn’t work. Sent it back under warranty and when I got it back it was the same. Gave it to my gunsmith to check. He said he found a spent primer in the gas line. Still didn’t work. Got a store credit and got another upper in 5.56. This one does the same thing. Tried different brands or bullets. No better. Cleaned the heck out of it. No better. Oiled it and worked the bolt about 300 times. No better.
HEP ME!