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Posted: 6/11/2011 12:55:26 PM EDT
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I have a Diablo PWS, one of the origional ones on the Vltor upper reciever.
I really like this weapon but I have had constant problems with the bolt stripping off the back of the casing as it is ejecting the round. I have changed ejectors, upgraded the ejector spring and insert, you name it and I have done it. My ammo is good. I dont shoot Wolf or any Russian. I mainly run Lake City XM193 and 855. My problems start around the 3 or 4th magazine and the bolt will strip completly off the back of the shell casing and I have to tap the shell out of the gun. The casing is damaged where the ejector strips off. My guns are clean so its not maintenance related but I'm stumped as to what would be causing it. I did notice the Diablo has had a design change. The bolt was redesigned with a spring added to the back of the bolt. They also arent using vltor uppers anymore. I'm wondering if anyone else was having this issue and if anyone knows why the change was made in the design? Thanks in advance for your input. |
| I own 2 PWS, an mk114 and an MK107, not to long ago I had ADDAX R&R my upper receiver for a VLTOR MUR1, my MK107 still has the original PWS upper receiver, I have taken it out a few times already and didn’t have any issues with it, it sounds like the brass expands inside the barrel and therefore making it hard to extract….is this how I am reading it? If so, why would it happen after the 3rd or 4th magazine? Is this a recurring thing? I am kind of stumped to on what can cause something like this, have you called PWS? Sometimes they send out technical bulletins on any issues with their weapons. I will follow this thread and see if others have the same problem your having and if they were able to resolve them to. Good luck and I hope you get the kinks worked out. |
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One thing PWS LWRC etc are known for is taking care of their customers.
Call or email them ASAP and let them know what is up. My guess is on the third or fourth magazine the gun is heated up therefore the chamber is smaller and more likely to hold the fired brass tighter. If you have cleaned the chamber extensively from a lot of shooting it might just be a hair bit too tight for a gun that shoots a lot of ammo. If you can see into the chamber make sure it does not have brass from a lot of shooting like copper fouling a barrel. Just taking a long shot on. You could run a chamber reamer a thousands over current but I would contact PWS and return the gun to them personally Wulfmann |
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I appreciate the input.
I haven't bugged PWS about it yet. Machines are bound to have hiccups so I have tried some things on my own but I'm now at the point that I'll give the factory a chance to look at it. I believe I'm looking at a tight chamber which is very possible. The only reason I wanted input was to see if the issue was happening in other rifles or if I was an isolated case. The design changes in the system got me thinking they may have seen this before. |
| OK, this might be an interesting note here. This morning I was at the Medcalf range in South San Jose attending a BBQ and to talking with a few guys. I mentioned that I read about a piston upper having extraction problems at around the third or fourth mag. One of the guys shoots a Bushmaster Predator, his rifle would not extract and always tear the casing during the first 6 or 7 rounds then after that it would shoot fine all day with no issues. He sent it back to Bushmaster and they replaced his barrel and it runs fine now. I know your problem seems to be the opposite of this guys problem because BM told him that the chrome lining on his barrel “may” have not been to specs. So when the barrel is cold, the feed is tight till the barrel has had the time to warm up and expand therefore making the feed easier. Your problem is that when your barrel gets hotter after the third or fourth mag is when you have the extraction problem which has got me stumped. Send it back to PWS, they have excellent customer service from my experience. Your Diablo can dump fifteen 30 round mags one after another easy as I have done this with mine. By the way….Wulfmann….my question is, would reaming out the barrel for easy feed have any adverse affect on accuracy?...just wondering? |
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Quoted: One thing PWS LWRC etc are known for is taking care of their customers. Call or email them ASAP and let them know what is up. My guess is on the third or fourth magazine the gun is heated up therefore the chamber is smaller and more likely to hold the fired brass tighter. If you have cleaned the chamber extensively from a lot of shooting it might just be a hair bit too tight for a gun that shoots a lot of ammo. If you can see into the chamber make sure it does not have brass from a lot of shooting like copper fouling a barrel. Just taking a long shot on. You could run a chamber reamer a thousands over current but I would contact PWS and return the gun to them personally Wulfmann Statement in red is completely opposite of the truth. There is no metal on earth that CONTRACTS when it is warm. It's called thermal expansion: |
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Quoted:
Quoted:
One thing PWS LWRC etc are known for is taking care of their customers. Call or email them ASAP and let them know what is up. My guess is on the third or fourth magazine the gun is heated up therefore the chamber is smaller and more likely to hold the fired brass tighter. If you have cleaned the chamber extensively from a lot of shooting it might just be a hair bit too tight for a gun that shoots a lot of ammo. If you can see into the chamber make sure it does not have brass from a lot of shooting like copper fouling a barrel. Just taking a long shot on. You could run a chamber reamer a thousands over current but I would contact PWS and return the gun to them personally Wulfmann Statement in red is completely opposite of the truth. There is no metal on earth that CONTRACTS when it is warm. It's called thermal expansion: And when the INNER walls of the chamber expand, does that make for a tighter or looser chamber? 
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Yeah I didn't want to jump the guy for that. I figured someone else would explain it to him––––––––slowly
You see, if the metal did the opposite of what i said it would contract and the chamber would get bigger. When the metal heats it expands so the chamber gets smaller and tighter. Wulfmann |
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Quoted:
Yeah I didn't want to jump the guy for that. I figured someone else would explain it to him––––––––slowly
You see, if the metal did the opposite of what i said it would contract and the chamber would get bigger. When the metal heats it expands so the chamber gets smaller and tighter. Wulfmann What????????????? It would get larger |
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I spoke with Stacey at PWS. Extremely helpful and they want the upper back. Initial guess is maybe the chamber is a tad tight. They will explore and address. He stated if it needed to be done they would replace the barrell all together.
It hit the mail today and they said it wouldn't need to be at their shop any more than 2 or three days. |
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Quoted: Quoted: Quoted: One thing PWS LWRC etc are known for is taking care of their customers. Call or email them ASAP and let them know what is up. My guess is on the third or fourth magazine the gun is heated up therefore the chamber is smaller and more likely to hold the fired brass tighter. If you have cleaned the chamber extensively from a lot of shooting it might just be a hair bit too tight for a gun that shoots a lot of ammo. If you can see into the chamber make sure it does not have brass from a lot of shooting like copper fouling a barrel. Just taking a long shot on. You could run a chamber reamer a thousands over current but I would contact PWS and return the gun to them personally Wulfmann Statement in red is completely opposite of the truth. There is no metal on earth that CONTRACTS when it is warm. It's called thermal expansion: And when the INNER walls of the chamber expand, does that make for a tighter or looser chamber? I'm sorry, but the reason shells are more difficult to extract when the gun is hot, is from fouling that blows back into the chamber, not because of shrinking chambers. |
Yes, and that does not change the fact that a hotter chamber makes for a tighter chamer because the inner diameter of the chamer expands inwards. 
Quoted:
Quoted:
Quoted:
Quoted:
One thing PWS LWRC etc are known for is taking care of their customers. Call or email them ASAP and let them know what is up. My guess is on the third or fourth magazine the gun is heated up therefore the chamber is smaller and more likely to hold the fired brass tighter. If you have cleaned the chamber extensively from a lot of shooting it might just be a hair bit too tight for a gun that shoots a lot of ammo. If you can see into the chamber make sure it does not have brass from a lot of shooting like copper fouling a barrel. Just taking a long shot on. You could run a chamber reamer a thousands over current but I would contact PWS and return the gun to them personally Wulfmann Statement in red is completely opposite of the truth. There is no metal on earth that CONTRACTS when it is warm. It's called thermal expansion: And when the INNER walls of the chamber expand, does that make for a tighter or looser chamber? I'm sorry, but the reason shells are more difficult to extract when the gun is hot, is from fouling that blows back into the chamber, not because of shrinking chambers. |
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