Anyone had anything to do with these?
AR15 Bolt assembly | Trade Me
Any other comments or suggestions
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Anyone had anything to do with these?
AR15 Bolt assembly | Trade Me
Any other comments or suggestions
Well it's non mil-spec steel, possibly inferior. Have to install + stake the gas key yourself. No experience but I personally wouldn't buy one.
SKD 61 is meant to be equivalent or better than carpenter 158, these are made in Taiwan and apparently what CMMG use. I have one of the chrome bolts in my parts bin. I can't verify the above, it's just "what I've heard"
I think the interior isn't chrome lined on them.
I had a quick google to try find the info on SKD61 and didn't get anywhere.
Ok cheers guys.
These ar's are going to become an expensive hobby....
Ok cheers guys.
These ar's are going to become an expensive hobby....
Seems ok Tabel Ukuran, Berat & Spesifikasi Besi&Baja: SKD61 Steel And Equivalent
How does it compare to C158 or 9310 as they're the standards for bolts/BCGs
Has about 5%cr vs 1.5%cr in 9310. Thats the main difference I can see
difference would be in hardness/tensile strength/yield strength somewhere maybe? or the preceding at higher temps
I have one of these in the parts bin as a spare. These are the same BCG's that CMMG use in their rifles. Overall, they look nicely machined, and for that price it includes the bolt too, which is pretty sharp by NZ standards.
Hard to go wrong really.
Cheers think I will get it
I know the person who imports these-let's just say he is very fussy about AR stuff and he runs these in his own rifles.
I will be visiting the factory they were made in (is only a couple of km from my apartment)in a couple of weeks,and the promo stuff they have provided me with speaks very highly of the steel they use-and the selection criteria used to chose it.
Remember that Taiwan is not mainland china
These guys? ARMSTEK.COMQuote:
Originally Posted by res
That's the same address...
Hi guys these are my BCG's. I have had one running in my 3 gun/varmint rifle for about 15 months now done just under 2000 rounds, no issues. To be honest the only downside of these is that they don't chrome the inside of the bolt hole. If this will only be an issues if you don't clean but then I also sell fulled chromed bolts and carriers for only $20 more. Staking is simple but them come unstaked so thats how I sell them. BTW the first M16s had bolts and carriers made from 8620 and 8620 is still an milspec steel for bolt manufacture. SKD 61 is whats called a mold steel and it has high resistance to fracturing, I talked to an engineer who looked at the metallurgy behind it and said that it was more than fit for the purpose intended. The Taiwanese cant get Carpenter 158 easily and this was what their American customers said would be a good substitute of what the can easily get. The SKD61 they use is made in Japan. They are just testing SNCM420H and they think this will be better again. My next shipment will include nickle boron coated assemblies. If anyone buys one and doesn't like the look of it then send it back for a full refund (Sorry once you have shot it you own it). Also feel free to measure it up for dimensional accuracy, I have and they are Mil Spec; but feel free to satisfy your curiosity. At the recent NZRA nationals a bolt fractured and two others who were watching mentioned they had the same issue with their bolts, this North American manufacturer states MPI testing and High Pressure testing, I have yet to see a failure with any of my bolts and most of my personal loads are at 5.56 nato pressures.
Sorry just read the above post; excuse my poor spelling and grammar.