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Posted: 1/24/2017 11:33:05 AM EDT
[#1]
Adams Arms makes some. I just bought a 5.56 piston upper from there. No problems yet, but only 1 trip to the range under my belt.
http://www.adamsarms.net/products/rifles-lowers/300blk |
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Posted: 1/24/2017 12:11:58 PM EDT
[#2]
Call them they just released all the mod 2 in 300 blackout
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Posted: 1/25/2017 12:34:37 PM EDT
[#3]
Quote HistoryQuoted:
Adams Arms makes some. I just bought a 5.56 piston upper from there. No problems yet, but only 1 trip to the range under my belt. http://www.adamsarms.net/products/rifles-lowers/300blk Quote HistoryQuoted:
Adams Arms makes some. I just bought a 5.56 piston upper from there. No problems yet, but only 1 trip to the range under my belt. http://www.adamsarms.net/products/rifles-lowers/300blk I wish they made a 300 BLK upper in a length that was in the 9-10 inch range. 
Quoted:
Call them they just released all the mod 2 in 300 blackout Do you know what barrel lengths they are offering now by chance? I have tried looking at their website and whenever I get to the Mod 2 page, my browser crashes. This thread is quite relative to my interests. 
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Posted: 1/25/2017 12:44:04 PM EDT
[#4]
Their new website is terrible. Cant find details on anything. For what its worth, the original MK109 has been a great gun if and only if you keep it clean. I shoot only suppressed subs. It gets dirty fast and then starts to have problems cycling. While its a fun gun its just not reliable enough for me. I would rather use it as a bat in a home defense situation than have to depend on it to function properly. Really ticks me off as 300blk is my favorite round to shoot. I assume this would not be a problem if not suppressed, but that is not what I do.
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Posted: 1/25/2017 4:12:42 PM EDT
[#5]
Black Rifle Arms makes nice 300BLK piston uppers. The ones in stock are 10". They run with M16 carriers and standard carbine spring/buffers.
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Posted: 1/25/2017 11:07:24 PM EDT
[#6]
Quote HistoryQuoted:
Their new website is terrible. Cant find details on anything. For what its worth, the original MK109 has been a great gun if and only if you keep it clean. I shoot only suppressed subs. It gets dirty fast and then starts to have problems cycling. While its a fun gun its just not reliable enough for me. I would rather use it as a bat in a home defense situation than have to depend on it to function properly. Really ticks me off as 300blk is my favorite round to shoot. I assume this would not be a problem if not suppressed, but that is not what I do. Yeah, the article in the first post goes into the problems. I was surprised how dirt it got... and not just carbon. The piston had some serious copper build-up. I was wondering if they discontinued it because of all the problems. I guess they redesignated it... so I'm wondering if they fixed the problems the 109 had or just rebranded the same turd. I like the idea of the long-stroke piston, I just wonder if it's not good for that application, not good suppressed, or if their execution of it had too many flaw to work properly. |
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Posted: 1/26/2017 6:24:37 PM EDT
[#7]
Quote HistoryQuoted:
Yeah, the article in the first post goes into the problems. I was surprised how dirt it got... and not just carbon. The piston had some serious copper build-up. I was wondering if they discontinued it because of all the problems. I guess they redesignated it... so I'm wondering if they fixed the problems the 109 had or just rebranded the same turd. I like the idea of the long-stroke piston, I just wonder if it's not good for that application, not good suppressed, or if their execution of it had too many flaw to work properly. Funny you mention the copper build up. I called them and asked what the deal with that was. Specifically I had a ton of copper build up on my piston. I searched this forum and found a copper solvent to use. That removed all the copper. PWS told me to use a solvent as well. They said that it was normal during barrel break in. They said that since I am shooting subs, my break in would take longer than if using supers. He suggested going through a bunch of supers to break in the barrel. |
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Posted: 1/26/2017 10:20:35 PM EDT
[#8]
The copper is from the bullet being shaved inside the barrel from the burs on the gas port. The gas pushes the copper residue inside the gas block and it attaches itself to the piston and gas plug. The burrs get cut down eventually it just depends on how tall they were and what's your barrel lined with chrome,nitride or just bare stainless of chrommoly. The manufacture I used to work at had a sub moa guarantee. I had to lap out the chips on nitride barrels ....LOL was not fun and very time consuming....
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Posted: 1/26/2017 10:39:29 PM EDT
[#9]
Quote HistoryQuoted:
The copper is from the bullet being shaved inside the barrel from the burs on the gas port. The gas pushes the copper residue inside the gas block and it attaches itself to the piston and gas plug. The burrs get cut down eventually it just depends on how tall they were and what's your barrel lined with chrome,nitride or just bare stainless of chrommoly. The manufacture I used to work at had a sub moa guarantee. I had to lap out the chips on nitride barrels ....LOL was not fun and very time consuming.... So where does it go in a DI system? |
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Posted: 1/27/2017 6:13:34 AM EDT
[#10]
I was actually asking PWS about MK109 at SHOT. It is discontinued in favor of new 11" model.
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