[UPDATE: Issue solved. Needed a heavier H2 buffer to slightly slow down cycle time]
Good evening all, having an issue with my 8.5” PSA upper. Looking for some guidance. I don’t have experience investigating feed ramps to know if there is an issue with them or not. The pistol will fire first round successfully, but the 2nd round will jam against the feed ramps. Will do this either suppressed or unsuppressed. Repeated issue with different 300bo Magpul mags. Visually I don’t see an issue with the ramps, but I’m also not sure what I should be looking for outside of an obvious defect. I guess I’m looking for direction here, is this something I can address or do I contact PSA customer serivce?
Can you take a picture looking down the barrel from the rear of the upper? It might a little tough of a picture to get, but it will show if anything is out of alignment. Also, do you have any other ammo to try? Every gun is a little different on the ammo it likes, but a full on jam seems unusual. If you are able to manually cycle the bolt, does it only jam on even numbered rounds? As in, whenever the bullet comes up on the right of the magazine, for example.
Customer service is always an option, but this sort of troubleshooting can be a good way to learn more about your firearm. At least for a bit until it’s frustrating.
Best pic I could get. I can’t feel anything with my finger. The issue was always the same. Round on the opposite side of the ejection port would crash into the ramp and jam. That is the only brand of ammo I currently have.
I just manually cycled a round from each side of the mag and both loaded just fine. No jam.
BTW, you state “pistol” in your description along with a SOPMOD stock. It can’t be both. If you have a stock you need a tax stamp, otherwise you need a brace on it.
Great. I’ll try that. I had an idea that the buffet was racing past normal cycling, just didn’t think it through. I’ll pick up an H2 today and give it a try.
It appears that there is a misalignment point (doesn’t line up between receiver and breech). That could catch the bullet tip, especially hollow points. Polishing would not be the word I would use, maybe machining.
If it’s a Carbine buffer, you don’t even need to depress the retainer - merely push the buffer in with your finger, and get it to rotate to one of the “relief cuts” on the face of it - it should pop-past the retainer, and then you just sort of wiggle the buffer and spring out. It helps having the upper unpinned from the lower. Install is the reverse.
I see that also, I can barely feel it with a metal pick. I think the photo makes it look worse than it is. It’s very hard to actually grab with a fine point, but maybe that’s all it takes to grab a round.
