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Posted: 7/21/2014 6:46:19 PM EDT
[#1]
I don't think you can use a DI bolt carrier with a piston without risking the carrier key being ripped off over time. I might be mistaken though, but that is how I understand it, you would need a one piece bolt carrier.
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Posted: 7/21/2014 7:56:14 PM EDT
[#2]
Hmmm this is a tough one, but I thought about it for a while and here's what I came up with.
Order the exact same BCG that's inside the upper receiver of the carbine you just ordered from the company that manufactured it. Brilliant, I know 
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Posted: 7/21/2014 9:51:48 PM EDT
[#3]
If you ordered the mk116 mod 1, then it is long stroke piston so a DI bcg will definitely not work. If you want the spare BCG then just buy the BCG from Apex, here is a link:
pws mk1 bcg |
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Posted: 7/22/2014 6:20:55 AM EDT
[#4]
Have to buy the same proprietary long stroke piston BCG that came with the MK1. mrc44 pointed out Apex. Good company.
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Posted: 7/22/2014 7:03:09 AM EDT
[#5]
APEX looks like a good source, thanks to all. Maybe I was in too big of a hurry when I went to the PWS web site but the only BCG I found was for a DI system which I thought was odd. I appreciate everyones input, I am not the most technical savvy person and this is my first piston system so I just wanted to be sure I did not make a $200 mistake.
Thanks again for everyones thoughts and help!! |
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Posted: 7/22/2014 7:23:21 AM EDT
[#6]
No problem. I've looked for it on their site before and couldn't find it either. I'm sure there's a reason.
Congrats, that's an excellent piston rifle. Many quality components in it but IMHO the PWS BCG is the reason it's superior to other AR piston rifles. |
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Posted: 7/22/2014 7:29:36 AM EDT
[#7]
Quote HistoryQuoted:
I don't think you can use a DI bolt carrier with a piston without risking the carrier key being ripped off over time. I might be mistaken though, but that is how I understand it, you would need a one piece bolt carrier. The op rod on PWS's system bolts on in place of the gas key. Because it's long stroke it's not as brutal as the short stroke systems out there. Those used to be sold with a carrier key replacement until too many of them sheared off, then they went to the one piece carrier. A normal BCG will work in the PWS system, just have to replace the gas key with an op rod. |
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Posted: 7/22/2014 8:44:32 AM EDT
[#8]
Funny you mention that. Was going to explain exactly that to the OP for context and then edited it out.
Figured he was just looking for the correct replacement BCG. |
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Posted: 7/22/2014 8:47:03 AM EDT
[#9]
Quote HistoryQuoted:
Funny you mention that. Was going to explain exactly that to the OP for context and then edited it out. Figured he was just looking for the correct replacement BCG. Their DI carrier looks identical to their piston carrier to me, with the obvious difference being the gas key v. op rod. |
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Posted: 7/22/2014 9:16:20 AM EDT
[#10]
Yessir, that's what I thought the first time I saw it too.
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Posted: 7/22/2014 2:17:49 PM EDT
[#11]
Would you buy just a bolt or the BCG? Is it likely that I would ever need to replace anything but a part of the bolt itself? Again, I am just looking to have a spare for back up.
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Posted: 7/22/2014 2:26:16 PM EDT
[#12]
You cannot use another BCG without heavily skilled machinist work. You can use a spare .223 or 5.56 DI bolt assembly as a spare for the original after you have removed the gas rings.
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Posted: 7/22/2014 2:29:16 PM EDT
[#13]
Quote HistoryQuoted:
You cannot use another BCG without heavily skilled machinist work. You can use a spare .223 or 5.56 DI bolt assembly as a spare for the original after you have removed the gas rings. What is so different about the PWS BCG that you couldn't use a standard DI with the correct op rod in place? |
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Posted: 7/22/2014 4:20:04 PM EDT
[#14]
Quote HistoryQuoted:
Would you buy just a bolt or the BCG? Is it likely that I would ever need to replace anything but a part of the bolt itself? Again, I am just looking to have a spare for back up. I'd get the complete BCG. Extra parts are never a bad problem. You can always sell or trade them down the line if not needed. Sure, your first failures will likely be bolt-related and you'll probably never have a carrier issue. So if all you want is a bolt or bolt maintenance kit, you can get away with that. It's a machine, so you can't always anticipate what future problems will occur. Plus it's a proprietary design in a nice rifle. Yes, you can cannibalize DI parts in a pinch if needed but ideally I'd buy factory parts while they're in stock and reasonably priced, so I could use it as designed ten years from now. |
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Posted: 7/22/2014 4:46:37 PM EDT
[#15]
Mtel, that makes sense to me, so complete BCG it will be, better safe than sorry!
Again,thanks to all for your suggestions.... |
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Posted: 7/23/2014 9:01:00 AM EDT
[#16]
Quote HistoryQuoted:
What is so different about the PWS BCG that you couldn't use a standard DI with the correct op rod in place? Quote HistoryQuoted:
Quoted:
You cannot use another BCG without heavily skilled machinist work. You can use a spare .223 or 5.56 DI bolt assembly as a spare for the original after you have removed the gas rings. What is so different about the PWS BCG that you couldn't use a standard DI with the correct op rod in place? Apparently, there are interlocking machined surfaces in the top of the carrier and on the operating rod/key that take the shear forces of the gas impacting and driving the piston backwards. The DI carrier does not have those machined cavities/surfaces and as a result they are not compatible. |
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Posted: 7/23/2014 10:06:07 AM EDT
[#17]
Good nugget, where'd you find it? And I don't mean that in the sarcastic way most people use it when they're really calling someone a liar.
I just like the PWS piston guns and the details about them. |
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Posted: 7/23/2014 10:16:27 AM EDT
[#18]
Here's a pic of a sheared PWS carrier drive key. It shows both screws and the locating pin sheared.
Pic was dated 2010 http://www.treehopr.net/aar/tag/rifle-training/page/2/ 
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Posted: 7/23/2014 10:36:46 AM EDT
[#19]
Quote HistoryQuoted:
Here's a pic of a sheared PWS carrier drive key. It shows both screws and the locating pin sheared. Pic was dated 2010 http://www.treehopr.net/aar/tag/rifle-training/page/2/ http://i30.photobucket.com/albums/c341/faawrenchbndr/PWS%20Diablo/5bef4c07-a754-46bd-99a1-a1d9312eca30.jpg Looks like a standard bolt carrier |
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Posted: 7/23/2014 10:57:40 AM EDT
[#20]
Nope.......you are mistaken.
Look at the "key" also take a look in the link. Let me help ya out a bit....still look like a standard carrier? 
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Posted: 7/23/2014 11:00:28 AM EDT
[#21]
PWS stuff was all revamped and now looks different.
If I was going to get a piston, it would be PWS. |
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Posted: 7/23/2014 11:07:25 AM EDT
[#22]
Quote HistoryQuoted:
Nope.......you are mistaken. Look at the "key" also take a look in the link. Let me help ya out a bit....still look like a standard carrier? http://i30.photobucket.com/albums/c341/faawrenchbndr/PWS%20Diablo/imagejpg1.jpg I'm looking at a stripped carrier right now. Obviously the key has been replaced with an op rod, I've been saying that. The carrier itself looks the same though. |
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Posted: 7/23/2014 11:08:06 AM EDT
[#23]
Quote HistoryQuoted:
Nope.......you are mistaken. Look at the "key" also take a look in the link. Let me help ya out a bit....still look like a standard carrier? http://i30.photobucket.com/albums/c341/faawrenchbndr/PWS%20Diablo/imagejpg1.jpg I beleive JoshAston was referring to the fact the carrier doesn't appear to have a machined interlocking surface, which would support PWS DI/piston BCGs being interchangeable. To be fair, that pic is dated 2010. It's possible the interlocking surfaces can be found on newer BCGs. |
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Posted: 7/23/2014 11:15:27 AM EDT
[#24]
I have yet to see an un assembled PWS carrier. This is how they were attached in '10.
Shy of taking my spare apart, this is the best I can do. I have not seen a pic of anything different. Someone needs to take one apart to show these " interlocks" |
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Posted: 7/23/2014 11:20:41 AM EDT
[#25]
Quote HistoryQuoted:
I'm looking at a stripped carrier right now. Obviously the key has been replaced with an op rod, I've been saying that. The carrier itself looks the same though. Quote HistoryQuoted:
Quoted:
Nope.......you are mistaken. Look at the "key" also take a look in the link. Let me help ya out a bit....still look like a standard carrier? http://i30.photobucket.com/albums/c341/faawrenchbndr/PWS%20Diablo/imagejpg1.jpg I'm looking at a stripped carrier right now. Obviously the key has been replaced with an op rod, I've been saying that. The carrier itself looks the same though. I suspect it was once a modified DI carrier. They aren't now. |
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Posted: 7/23/2014 11:26:41 AM EDT
[#26]
Quote HistoryQuoted:
I suspect it was once a modified DI carrier. They aren't now. I know they've made changes to the rear of the carrier to prevent tilt, they've implemented the same changes in their DI carrier. Have there been any changes to the area where the gas key/op rod bolts on though? |
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Posted: 7/23/2014 11:30:54 AM EDT
[#27]
It's still bolt on.
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Posted: 7/23/2014 11:33:11 AM EDT
[#28]
Prior to this thread,......I had never heard of any tabs. I was understanding that the let had a locating pin and two screws, as shown.
You guys really make me want to take mine apart......but i'm not going to. |
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Posted: 7/23/2014 11:33:43 AM EDT
[#29]
Quote HistoryQuoted:
I have yet to see an un assembled PWS carrier. This is how they were attached in '10. Shy of taking my spare apart, this is the best I can do. I have not seen a pic of anything different. Someone needs to take one apart to show these " interlocks" Got it, appreciate the pic. That's why I was hoping Nekulturny had a reference from PWS about it. |
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Posted: 7/23/2014 11:34:55 AM EDT
[#30]
Quote HistoryQuoted:
I suspect it was once a modified DI carrier. They aren't now. Very true....... |
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Posted: 7/23/2014 11:35:57 AM EDT
[#31]
Quote HistoryQuoted:
Got it, appreciate the pic. That's why I was hoping Nekulturny had a reference from PWS about it. Quote HistoryQuoted:
Quoted:
I have yet to see an un assembled PWS carrier. This is how they were attached in '10. Shy of taking my spare apart, this is the best I can do. I have not seen a pic of anything different. Someone needs to take one apart to show these " interlocks" Got it, appreciate the pic. That's why I was hoping Nekulturny had a reference from PWS about it. I understand.......I have never heard anything different. |
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