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Thread: New Sharps Relia-Bolt design using S7 tool steel.

  1. #91
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    If it ain't broke, don't fix it

  2. #92
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    Quote Originally Posted by mhenson07 View Post
    If it ain't broke, don't fix it
    Well the bolt is one of the few areas the AR could use an improvement.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  3. #93
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    Quote Originally Posted by Tokarev View Post
    I did ask about the lack of an insert in one of my earlier emails to Tim but there were a couple other questions within the email so it got overlooked. I will send him another asking aboout the insert.







    Sent from my GT-P3113 using Tapatalk
    Thanks, I don't see the need for an insert personally with the used of the O-ring and that could have been their thinking to.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  4. #94
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    For those who asked earlier, Carpenter 158 is currently about $8-10 per pound in small volumes, if you can find it. It's not really used anymore in mold making because there are fancier powdered metallurgical steels available (the metallurgy in firearms manufacturing is very conservative). On Practical Machinist (a forum for machinists and shops), one of the shops was quoted a 10-ton order at $5/lb for manufacturing these AR-15 bolts to purchase a mill lot. Mills don't just have this stuff sitting on shelves because of low demand, so often you have to buy an entire run's worth and sell the rest you don't use, or sit on it and hope your customer orders more in the future. FYI, Carpenter 158 is a proprietary name for AISI P6, so if you want more information, look up AISI P6 steel specifications. Before it was absorbed by another company in the early 2000's, it was sold by Bethlehem Steel as Duramold-N series.

    S7 (AISI S7) tool steel is about $13-15 per pound in small volumes, depending on vendor and finish (mill finish, ground stock, etc) A couple different proprietary names would be Crucible S7 XL, Thyssen S7, Carpenter S7, or Supershock S7.

    I use .29lb/in^3 to convert volume to mass given every steel allow varies in mass a little, depending on alloying content. For AR bolts starting from rough sawn 3/4"barstock before heat treat, you're looking at a material value of about $10 per slug. Add about $1-2 per lb with the initial heat treat for toughness, depending on lot size and type. Then machine time. I don't know if AR bolts are case hardened on top of that for surface wear characteristics. A shop with a good turning center and barfeed could crank these out like candy. Another example. Several barrel makers utilize 17-4PH stainless steel as a premium material. We order many tons of the stuff because we OEM for several large abrasive waterjet companies. Their intensifier assembly components operate at 60-90kpsi so it's a similar application as far as repetative pulsed tensile stresses. 17-4PH costs us $2.61/lb. That makes raw material costs for gun barrels about $15 with heat treat if purchased in the same volumes.

    What the market will support is the primary determining factor of cost, not the raw material. The markups for premium materials is not linear to the final cost of the product itself. The worst offender of this is titanium products, simply because "titanium". People shouldn't be concerned about what the raw material cost is or what the machine time is, or mark-up. The only factor that really matters would be how the value compares to other products on the market.
    Last edited by Cesiumsponge; 06-07-14 at 14:12.
    “The practical success of an idea, irrespective of its inherent merit, is dependent on the attitude of the contemporaries." Nikola Tesla

  5. #95
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    Wow, very interesting!

  6. #96
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    interesting.....anyone notice the market is flooded with companies making carriers?

  7. #97
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    Isn't the M107 bolt made from S7 as well? I did find out the 7,500 rounds HO white shot took place over 5 days, that's actually pretty impressive given 7,500 rounds over 5 days is about 1,500 rounds a day. That's a much harsher schedule than I had imagined......For some reason I did not see them doing it in such a short period. That is actually right at the end of a standard bolts life, do you know if they are continuing to use that bolt to see how long it has left?
    Last edited by sinlessorrow; 06-12-14 at 03:37.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  8. #98
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    Definitely a well machined and finished bolt....i was very impressed when I received mine.....if it performs half as good as it looks it will be a bargain at $80....i was so impressed I had to order a second one.
    Last edited by Regalkismet; 06-12-14 at 20:45.

  9. #99
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    Some more info from Sharps that confirms my thoughts.

    As for your question regarding the omission of an extractor buffer insert: Our rigid functionality testing showed that the addition of an extractor buffer insert added no functional advantage in extraction. Therefore we have chosen not to use them with our high tensile strength spring and rubber donut extractor spring setup.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  10. #100
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    Quote Originally Posted by Regalkismet View Post
    Definitely a well machined and finished bolt....i was very impressed when I received mine.....if it performs half as good as it looks it will be a bargain at $80....i was so impressed I had to order a second one.
    Just ordered two myself. There were 47 in Stock when I placed my order. Just double checked and only 45 left. I really like real - time inventory tracking!

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