Posted: 9/1/2014 8:01:55 PM EDT
|
This is about a new 7.5" Radical Firearms upper I bought from you guys recently. I almost described this as a double feed, and then realized that it's a not a double feed but possibly an extraction issue. I took the new 7.5" upper to the range over the weekend and this is what happens. I chamber the first round and fire and it goes boom. Then, click. I guess I didn't notice the casing hadn't ejected. I look and notice that the first round had not been ejected and the second round had fed far enough forward that it was ahead of the first one. I remove the mag and notice that the firing pin had left a slight mark on the primer. I removed the rounds and tried again and the same thing happens. I tried this with a PMAG, a USGI mag, and even a Lancer. I tried with 75 grain and 55 grain with the exact same problem. The extractor on the BCG seems to work fine and when I cycle it manually, it extracts every single time. The range officer said he thinks the gas tube is too short. I'd think a pistol length tube would be suitable for a 7.5 but I'm wondering if not enough pressure is being delivered via the gas tube to cycle it properly. I assembled the lower myself and use a Spike's T2 buffer. Since it is new, I figured you are the guys to talk to, first. I would think Radical Firearms would be the folks to talk to, but their website has a no return policy and it seems like they don't offer a warranty. Maybe I'm reading it wrong. What do you guys recommend? I trust PA so I know you guys wouldn't steer me in the wrong direction. |
|
Quoted: Sounds under gassed - but use a standard carbine buffer before you really call it an issue. The T2 is heavy. From most of the posts I've read, folks with 7.5 inch barrels seem to recommend this buffer. It's the one I have on all my ARs, anyway. I seriously doubt that this is a buffer issue, though. The case wasn't just not ejecting all the way. The second round was fed directly underneath the previous one that did go off.
|
|
If the buffer is too heavy or under gassed it will not fully cycle. If it doesn't fully cycle, it will go back just enough to strip the next round but not eject the last case which is exactly the problem you're having.
Try a lighter buffer. Maybe RA took note of the issues people had with the over gassed 7.5s people have and made the gas port smaller to run standard carbine buffers. Also try running a different BCG so you can narrow it down to exactly what is wrong. My bet is the buffer fixes it. What happens when you load one round into the magazine and fire it? |
|
Quoted: If the buffer is too heavy or under gassed it will not fully cycle. If it doesn't fully cycle, it will go back just enough to strip the next round but not eject the last case which is exactly the problem you're having. Try a lighter buffer. Maybe RA took note of the issues people had with the over gassed 7.5s people have and made the gas port smaller to run standard carbine buffers. Also try running a different BCG so you can narrow it down to exactly what is wrong. My bet is the buffer fixes it. What happens when you load one round into the magazine and fire it? |
|
Quoted:
This is about a new 7.5" Radical Firearms upper I bought from you guys recently. I almost described this as a double feed, and then realized that it's a not a double feed but possibly an extraction issue. I took the new 7.5" upper to the range over the weekend and this is what happens. I chamber the first round and fire and it goes boom. Then, click. I guess I didn't notice the casing hadn't ejected. I look and notice that the first round had not been ejected and the second round had fed far enough forward that it was ahead of the first one. I remove the mag and notice that the firing pin had left a slight mark on the primer. I removed the rounds and tried again and the same thing happens. I tried this with a PMAG, a USGI mag, and even a Lancer. I tried with 75 grain and 55 grain with the exact same problem. The extractor on the BCG seems to work fine and when I cycle it manually, it extracts every single time. The range officer said he thinks the gas tube is too short. I'd think a pistol length tube would be suitable for a 7.5 but I'm wondering if not enough pressure is being delivered via the gas tube to cycle it properly. I assembled the lower myself and use a Spike's T2 buffer. Since it is new, I figured you are the guys to talk to, first. I would think Radical Firearms would be the folks to talk to, but their website has a no return policy and it seems like they don't offer a warranty. Maybe I'm reading it wrong. What do you guys recommend? I trust PA so I know you guys wouldn't steer me in the wrong direction. Email [email protected] we will take care of it for you. -Dimitri |
|
Quoted: Quoted: This is about a new 7.5" Radical Firearms upper I bought from you guys recently. I almost described this as a double feed, and then realized that it's a not a double feed but possibly an extraction issue. I took the new 7.5" upper to the range over the weekend and this is what happens. I chamber the first round and fire and it goes boom. Then, click. I guess I didn't notice the casing hadn't ejected. I look and notice that the first round had not been ejected and the second round had fed far enough forward that it was ahead of the first one. I remove the mag and notice that the firing pin had left a slight mark on the primer. I removed the rounds and tried again and the same thing happens. I tried this with a PMAG, a USGI mag, and even a Lancer. I tried with 75 grain and 55 grain with the exact same problem. The extractor on the BCG seems to work fine and when I cycle it manually, it extracts every single time. The range officer said he thinks the gas tube is too short. I'd think a pistol length tube would be suitable for a 7.5 but I'm wondering if not enough pressure is being delivered via the gas tube to cycle it properly. I assembled the lower myself and use a Spike's T2 buffer. Since it is new, I figured you are the guys to talk to, first. I would think Radical Firearms would be the folks to talk to, but their website has a no return policy and it seems like they don't offer a warranty. Maybe I'm reading it wrong. What do you guys recommend? I trust PA so I know you guys wouldn't steer me in the wrong direction. Email [email protected] we will take care of it for you. -Dimitri |
|
Quoted:
Thanks to the folks at Primary Arms, again. They got me in touch with Radical Firearms and I'm working directly with them to get back on track. It's good to know we have local companies who try to take care of their customers. let us know how it turns out Dimitri |
|
I'm sorry. I forgot to post an update. I went by the Radical firearms storefront and they swapped out BCGs and everything seems to work fine, now. They fired six shots in a row of XM193 without a hitch. I'll take it to the range, soon. Thank you for all your help. I really appreciate it.
|
|
Quoted: I imagine it would, yes. Quoted: Quoted: Quoted: Only thing I can think of is an obstruction between the gas key and the carrier that was impeding the flow of gas. Would a loose gas key cause that problem? I imagine it would, yes.  |