u/ifitpleasesthecrown · 2024-05-28 14:23:46 UTC · score 5

in a community built around diy guns, it's amazing to me how low people's bar is for troubleshooting around here, or awareness of how this stuff works. the mac uppers were never designed to take the beating that ar hammer's put on them. It causes issues with all of them.

u/Btbam1122 · 2024-05-28 15:32:39 UTC · score 4

I'll just throw in that mine came non operational; the two studs that hold the picatinny section on weren't ground down properly in the reciever and  caused the bolt to not move. In their defense I  emailed and got a response like an hr later giving me details on how to return it.

u/Bandito1157 · 2024-05-28 17:13:41 UTC · score 2

Yeah the velocity ones are pretty good, I got two of them. One of the cheapest ones you can get too.

u/twatwaffle32 · 2024-05-28 17:48:27 UTC · score 8

Velocity uppers have shitty firing pins bro. Ive had 2 break on me after just a few rounds. The one that came with the upper as well as the warranty replacement they sent me. It's their temper.

Get the JC arms firing pin. The guy reprofiled the firing pin to be more reliable and his temper is on point. I think he also offers a lifetime warranty.

u/thehighsman0503 · 2024-10-22 13:01:58 UTC · score 1

I just ordered their barrel and trunion last night. Are they good to go or should I cancel and get it elsewhere?

u/DaFizzlez · 2024-05-28 15:08:43 UTC · score 4

I’ll throw out JC Arms as a great alternative. Was also the first to bring back extended length mac barrels, and is working on a mac upper that will feed from double stack/double feed mags.

u/ThatFNguy57 · 2024-05-28 15:13:05 UTC · score 8

For the bullet not seating, it's because the extractor spring is too stiff and won't let the extractor pop over the rim of the casing. I had that problem from another brand as well. I just drank beer, watched Tv, and constantly pressed down in the rear of the extractor. Probably 1000+ times. Or you can probably take the spring out and trim it up a bit

u/bowsewr · 2024-05-28 22:39:46 UTC · score 1

The machining on JC Arms on mine was great. I looked over it pretty good after seeing all the poor tool work on the aves

u/Accomplished-Sale392 · 2024-05-29 03:26:03 UTC · score 3

I wasn't a fan of the velocity arms personally. It wasn't awful but it definitely needed some light sanding and a different firing pin when I bought it. I hot a JC customs one and it has worked flawlessly.

u/Theloujihadeenrobot · 2024-05-28 14:18:43 UTC · score 27

Q.C definitely lacking 😑 I still haven't heard back from them for a firing pin that broke after a few mags. I ordered another from k.a.k and, while awaiting, made one from a hex key that's still kicking 🙃

u/Karddet · 2024-05-28 15:05:59 UTC · score 14

You won't regret your VMAC, I have 2 and love them

u/DethMayne · 2024-05-28 17:27:44 UTC · score 6

Got an aves rail kit, front rails were completely misshapen. Had to file them down to fit.

u/GreenLeg7809 · 2024-09-15 22:27:39 UTC · score 1

Jc arms Mac 11/9