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Sharps Rifle Company Balanced Bolt Carrier and Relia bolt

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  • SC-Texas

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    Last year at Shot Show, Sharps Rifle comoany provided a Sharps Rifle Company Balanced Bolt Carrier and Relia bolt with rounded/tapered lugs to use in one of my projects. Its manufactured from S7 steel and coated with NP3/NP3 PLUS.


    So, the question is do the radius cuts on the bolt make it more reliable?

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    Ole Cowboy

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    To answer your ! It most LIKELY does, given that the radius does not leave the walls to thin. I am not concerned with that based upon their engineering approach, I am sure that was taken into consideration before then integrated the radius cuts.

    In addition the 'shear' loads are not a major factor in bolt design.

    The radius cuts generally speaking both lighten and strengthen the component.

    IMO I think their product is one of the best as viewed from and engineering paradigm. I have never owned one, but am impressed with the product. Keep us in the loop as to how it performs...
     

    SC-Texas

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    That's the AR-15 that I installed It In.
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    CyberWolf

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    I have 2 of the Sharps XPB Xtreme Performance BCG's in use (updated version).

    No problems at all so far (evem with a bit of hard-use), they're currently my favorite AR15-sized BCGs...
     

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    Darqhelmet

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    Jim Sullivan (The man that created the AR15) is still working on them. He is adamant that lighting the bolt carrier is the worst thing you can do.


    starts talking about that around 6:25. It seems like going to a higher grade steel (S7) on your bolt is just going to wear your barrel extension out faster. In practice you should be replacing your barrel, barrel extension, and bolt at the same time and buying them matched from the same manufacture. If not that you need to be checking headspace. Its almost impossible to screw up and AR15 but it is.
     

    smittyb

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    Jim Sullivan (The man that created the AR15) is still working on them. He is adamant that lighting the bolt carrier is the worst thing you can do.


    starts talking about that around 6:25. It seems like going to a higher grade steel (S7) on your bolt is just going to wear your barrel extension out faster. In practice you should be replacing your barrel, barrel extension, and bolt at the same time and buying them matched from the same manufacture. If not that you need to be checking headspace. Its almost impossible to screw up and AR15 but it is.


    Hey Sean Cody, you are doing it all wrong.
     

    CyberWolf

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    ...He is adamant that lighting the bolt carrier is the worst thing you can do.

    It's actually not that simple even with basic DI considerations...

    When you look at all the "basic" factors involved including reciprocal mass, gas impulse volume (port/block/tube/etc.), timing & duration (gas system length & dwell-time), spring-rates, supressor/compensator, etc., there is no "one true" optimal path.

    One thing about greater mass is the delaying effect/inertia, which 'usually' opens up the acceptable operating window (more insulation from various failure modes), and helps with supressed shooting.

    Some applications call for decreasing carrier velocity, some for increasing it...




    ...It seems like going to a higher grade steel (S7) on your bolt is just going to wear your barrel extension out faster. In practice you should be replacing your barrel, barrel extension, and bolt at the same time and buying them matched from the same manufacture. If not that you need to be checking headspace. Its almost impossible to screw up and AR15 but it is.

    Just my opinion, but I wouldn't really be worried about excessive wear on the barrel extension; I can't remember ever having had an extension wear to the point of failing headspace on a barrel that wasn't also getting too long in the tooth.

    Totally agree about checking headspace, as it's one of the few opportunities for catastrophic failure due to component tolerances on an AR platform (assuming factory ammo), and easy enough that there's no reason not to do it (even high-end manufacturers can put out the occasional crap due to QA probs, and gauges are cheap).

    Also, I've run my two Sharps XPB bolts/carriers in a total of 6 uppers (3 x 5.56, 1 x .223 Wylde, and 2 x 300BO), all of which passed headspace checks (they currently live in 5.56 & .223W rigs).
     
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    SC-Texas

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    Another 60 rounds suppressed.

    As anyone ever noticed any permanent standing with the MP3 coating? I see that occasionally on certain parts
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    SC-Texas

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    3rd range session. 112 rounds of suppressed 5.56mm wipes off without any effort.
    Sharps Rifle company provided one of their Balanced Bolt Carrier and Relia bolts with rounded/tapered lugs to use in one of my projects. Its manufactured from S7 steel and coated with NP3/NP3 PLUS.
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