



100rd ACI drum actually runs great if you use the graphite lube it comes with. SPR collar came loose on me but otherwise the A4 LMG runs like a sewing machine. Got bit by fire ants in the dirt, 10/10 would do again.
Pictures are: After, Before, side profile of the lower.
I’ve had this C7/A1ish build for quite some time now. But it always bothered me that it wasn’t classic grey. A grey C7 upper was basically non-existent when I built it a few years ago (I’m a lefty so I kinda need the deflector) so I had to deal. It was also previously on a clone A4 lower, but that was more due to playing musical lowers than anything else. I had an H&R XM177-E2 lower hanging around that I switched over for this, at least it’s the right profile.
Took the plunge on some Norrell’s Flat Colt Grey-Black and fired up the toaster oven. It’s definitely not perfect, I’ve never used an airbrush before, but I’m pretty happy with it! Bought some parkerized lower parts last night to better go with it, and I think I’ll coat the MARC super safety I have installed too. Just waiting on my HEL-E4A to ship from IntlMilCo and the vibes will be complete.
After the first round of people installing these came to me with the same issues (only working FRT, cam not creating full reset) it’s pretty clear that the traditional Hoffman Tactical SS is NOT compatible with the mil spec burst trigger. I tested it myself last night with a regular SS and got the same results. I can fully confirm that it works perfectly with the Arc-Fire v1.
I’ll update this post with comparability information as we continue testing things out.
COMPATIBLE:
- Arc-Fire v1
NOT COMPATIBLE:
- Push button (Hoffman Tactical style)
NOT TESTED:
- Arc-Fire v2 variations
- Atrius/MARC (uncut trigger bar)
- Kabuto style drop ins
- AZ regulator