AK Sponsor
Posted: 12/4/2012 11:29:00 PM EDT
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Anyone use one of these?
http://shop.sportsmansguide.com/net/cb/cb.aspx?a=1003555 If so let us know how it is,what kits it works with |
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for less money you can get this
i used one and it wasnt too bad. did require some trimming. |
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The problem with the polish shells is heat treating them. Spot treating doesnt work on them, so you need to do a full heat treat. Kind of blows the advantage. what do you mean? shoudl be same heat treat as an ak builder flat. i just heated (the holes and ejector) cherry red with a mapp torch and then quenched in oil and then after cleaning threw it in the easy bake oven at 400 for an hour. if you start with a flat you have to do that anyway. only way around it is to buy a complete rec like a nodak. no? |
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The problem with the polish shells is heat treating them. Spot treating doesnt work on them, so you need to do a full heat treat. Kind of blows the advantage. what do you mean? shoudl be same heat treat as an ak builder flat. i just heated (the holes and ejector) cherry red with a mapp torch and then quenched in oil and then after cleaning threw it in the easy bake oven at 400 for an hour. if you start with a flat you have to do that anyway. only way around it is to buy a complete rec like a nodak. no? Difference is in the steel types. AK builder flats are 4130 steel, which takes the spot heat treatment method very well. Those Polish shells are 1050, a much milder carbon steel that won't take the heat treat as well, if at all. Hence why the common thought is you will have to fully heat treat it in a kiln oven or the likes. The full heat treat option raises the cost and coupled with all the holes you need to locate and drill (or at least buy another expensive jig) you are better off in my opinion to just bend a flat and do the spot heat treat method like you mentioned. |
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No X reinforcement over holes, no holes.. and I think you are more likely to mess up drilling the holes perfectly than bending the flat... I really don't see the advantage of having a flat pre-bent since that's the easiest part. You can get a flat with pre-bent and trimmed top rails and bent it in 10 minutes.
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There are different Polish blanks out there. It seems the ones with no X Y markings are 1050 carbon and need full heat treatment. The ones with the X Y markings only need spot treatment. You can easily tell the difference once you have them in hand. The 1050 bends in the hands of a 5 yr old, the other doesn't. I have a Polish Radom blank with the markings, and it is the same as an AK-Builder flat as far as the hardness. Another forum has done testing on them and shown the difference in the Polish blanks, and the types out there.
Just be careful which one you buy. |
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Quoted:
There are different Polish blanks out there. It seems the ones with no X Y markings are 1050 carbon and need full heat treatment. The ones with the X Y markings only need spot treatment. You can easily tell the difference once you have them in hand. The 1050 bends in the hands of a 5 yr old, the other doesn't. I have a Polish Radom blank with the markings, and it is the same as an AK-Builder flat as far as the hardness. Another forum has done testing on them and shown the difference in the Polish blanks, and the types out there. Just be careful which one you buy. That's good to know. It also explains why a build of mine with the xy markings hasn't detonated yet like it was said would happen. |
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They are all 1050 steel. According to RTG Original Polish manufactured Tantal Receiver Blank. Proper steel, properly stamped and folded. http://www.robertrtg.com/tantal_blank.html Original Polish manufactured AKM-AKMS Receiver Blank. Proper steel, properly stamped and folded. http://www.robertrtg.com/akms_blank.html Also, Keepshooting.com lists their Polish bent as 4130: The Polish AK-47 receiver blank is manufactured from normalized 4130 alloy steel http://www.keepshooting.com/polish-ak-47-receiver-blank.html According to kernalkrink on gunco, "some of the Polish shells are a "special case", one I helped a guy build on was so soft it bent out of shape literally every time we touched it! There are apparently several versions of this shell out there, and at least one is too dead soft to last long without full heat treat." There are long discussions on gunco and akfiles regarding this, with hardness tests being performed. They show that most of the Polish Blanks are the same as the flats being sold that only need spot treatment. The ones I have are exactly the same as the flats I have. None are soft 1050. Your mileage may vary, but there are different versions out there. |
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i have a couple of these and I have a dumb question....can you build a pistol with these legally? What about 922r, will it not count because of it being a pistol build? i thought WA had an assualt weapon ban? as long as they dont have one, you can build a pistola out of one of these and 922r does not apply to pistols. |
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They are all 1050 steel. According to RTG Original Polish manufactured Tantal Receiver Blank. Proper steel, properly stamped and folded. http://www.robertrtg.com/tantal_blank.html Original Polish manufactured AKM-AKMS Receiver Blank. Proper steel, properly stamped and folded. http://www.robertrtg.com/akms_blank.html Also, Keepshooting.com lists their Polish bent as 4130: The Polish AK-47 receiver blank is manufactured from normalized 4130 alloy steel http://www.keepshooting.com/polish-ak-47-receiver-blank.html According to kernalkrink on gunco, "some of the Polish shells are a "special case", one I helped a guy build on was so soft it bent out of shape literally every time we touched it! There are apparently several versions of this shell out there, and at least one is too dead soft to last long without full heat treat." There are long discussions on gunco and akfiles regarding this, with hardness tests being performed. They show that most of the Polish Blanks are the same as the flats being sold that only need spot treatment. The ones I have are exactly the same as the flats I have. None are soft 1050. Your mileage may vary, but there are different versions out there. The proper steel for AKs is Steel 50, which is a European equivalent to 1050 here. US made receivers are usually 4130. I don't know much about Gunco but, I do follow the threads at the Files and have never heard anyone say there are different steels. There is brushed and non-brushed finished versions but I dont think the material is different. I just had a batch heat treated and certified to be 36-38HRC. I told them the material was 1050 so that was the process they used and they came out the correct hardness so I am pretty sure they were all 1050, and there were both styles in the batch. Maybe on the next batch I can have them do some testing. |
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Quoted:
The proper steel for AKs is Steel 50, which is a European equivalent to 1050 here. US made receivers are usually 4130. I don't know much about Gunco but, I do follow the threads at the Files and have never heard anyone say there are different steels. There is brushed and non-brushed finished versions but I dont think the material is different. I just had a batch heat treated and certified to be 36-38HRC. I told them the material was 1050 so that was the process they used and they came out the correct hardness so I am pretty sure they were all 1050, and there were both styles in the batch. Maybe on the next batch I can have them do some testing. That would be good. It would be nice to have a couple blanks from different sources to test beforehand from an independent. From what I understand from all the threads is that there is a difference in the metal. There isn't in the blanks I have, from the flats from AK-builder and BMA.. They drilled the same and can't be deformed easily. Looking forward to what they have to say on hardness, thanks. |
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Quoted:
Quoted:
The proper steel for AKs is Steel 50, which is a European equivalent to 1050 here. US made receivers are usually 4130. I don't know much about Gunco but, I do follow the threads at the Files and have never heard anyone say there are different steels. There is brushed and non-brushed finished versions but I dont think the material is different. I just had a batch heat treated and certified to be 36-38HRC. I told them the material was 1050 so that was the process they used and they came out the correct hardness so I am pretty sure they were all 1050, and there were both styles in the batch. Maybe on the next batch I can have them do some testing. That would be good. It would be nice to have a couple blanks from different sources to test beforehand from an independent. From what I understand from all the threads is that there is a difference in the metal. There isn't in the blanks I have, from the flats from AK-builder and BMA.. They drilled the same and can't be deformed easily. Looking forward to what they have to say on hardness, thanks. Hardness of the flat or blank isn't the issue, its what type of steel it is which dictates the hardening process used. 4130 can be spot hardened with a torch but this method doesn't work with 1050. Or at least that's what I have heard, I have never just spot heated anything, I like my receivers fully hardened. |
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