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Thread: Bolt life question.

  1. #111
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    Quote Originally Posted by skullworks View Post
    A friend of mine bought a JP CTR-02 about two years back. He's been using it for IPSC Rifle, and during the Nordic Championships this weekend the bolt split into two. The round count is about 7000. $187 later he had a JP EnhancedBolt as a replacement. JP claims a bolt life of 60,000 rounds for these babies. What's your experience? Does anyone have a document round count for one of these bolts that surpass 20k?
    I asked this same exact question several pages back and never got an answer on JP EnhancedBolt round counts...

  2. #112
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    Quote Originally Posted by Brahmzy View Post
    I asked this same exact question several pages back and never got an answer on JP EnhancedBolt round counts...
    So you did. Well, now you got a free repeat.

  3. #113
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    Quote Originally Posted by VIP3R 237 View Post
    Yeah good luck with that. Ill stick with the more proven guys.
    Stag (as CMT) have been DOD Certified M4/M16 sub-contractors since the early 1970s. They are second only to Colt themselves in length of time producing USGI parts. They manufacture parts for all the top names.

    If you think Stag Arms isn't proven, you've been lied to.

  4. #114
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    I did find where and why people quote 5-6k for bolt life.

    Its what SOCOM has for their replacement schedule, this however is when the bolt develops micro cracks so they replace them just in case. They mentioned this in the SOPMOD 2006 NDIA.

    You could probably still get 8-10k out of a bolt with micro cracks though.

    @dangertree. Stag is not CMT. That is like saying bushmaster must be as good as remington because they are both cerberus
    Last edited by sinlessorrow; 07-20-12 at 10:59.

  5. #115
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    Quote Originally Posted by skullworks View Post
    A friend of mine bought a JP CTR-02 about two years back. He's been using it for IPSC Rifle, and during the Nordic Championships this weekend the bolt split into two. The round count is about 7000. $187 later he had a JP EnhancedBolt as a replacement. JP claims a bolt life of 60,000 rounds for these babies. What's your experience? Does anyone have a document round count for one of these bolts that surpass 20k?
    JP says on their webpage that "mil-spec" bolt lives max 6000 rounds and starts cracking by 3000 rounds. And that their bolt is better, because uses better steel. No bolt life claim. But 7000 rounds is more than 6000 for sure, so it is "better".

    Here we see different results. Some carbine bolts split in two at around 6000 rounds (do not remember make). On other hand my friends rifle length Stag uses same bolt for over 15000 rounds (rifle seem to be easier on bolts comparing to carbine).
    Last edited by montrala; 07-20-12 at 11:03.
    Montrala

    I'm sponsored competition shooter representing Heckler&Koch, Kahles, Hornady and Typhoon Defence brands in Poland, so I can be biased

    http://montrala.blogspot.com

  6. #116
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    Quote Originally Posted by sinlessorrow View Post
    @dangertree. Stag is not CMT. That is like saying bushmaster must be as good as remington because they are both cerberus
    Absolutely untrue.

    Stag Arms is the assembly wing of CMT, they are the same parts, same spec, same markings, same everything.

    If you think differently, you've been misled, (perhaps by someone trying to sell CMT sourced parts for more than Stag sells for, the main source of info running down Stag, particularly here).

  7. #117
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    For the stag thing, I've understood it as stag is CMT's storefront brand. I bought one a couple years ago(before I knew better). It has the 4140 barrel, untested barrel and bolt etc... however, I've had about 5k through it without a single malf. Its not a high round count - and is not to the specs of colt/noveske/bcm/dd etc, but for a "midgrade" ar, id say stag and SW are the 2 best of that group (I paid $750 otd). In fact, I've only seen 2 complaints/problems about stag and one was a rediculous round count - guy claimed thousandssSSS of rounds per month. All that said, Im having a top-grade gun put togethe once I get the funds.

    For the bolt stuff, the LMT bolts in theory should be better with the radiused lugs(where they come out of the bolt). This distributes the stress.

    Heat has been shown to be a non issue. Also, on TOS I think they had numbers posted - the carbine gas on a 16" barrel(maybe a 14.5") caused unlocking before the barrel depressurized down to the piston camber pressure levels. In midlengths, it was later reducing a lot of pressure from the lugs.

    For the cam pin hole, I would think that a midleth would help in 2 areas. 1- slightly slower cycling which means less stress. 2 - less pressure on bolt from the barrel gas, reducing friction on the lugs, which would reduce stress on the campin hole.

    These are just intuitive and not tested by me. Its hard to test since most large organizations use carbine gas.
    Last edited by MegademiC; 08-18-12 at 21:32.

  8. #118
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    I did some talking to Kevin and part of the reason for wanting a FF rail to phase out the M4 RAS was because apparently SOCOM found that it increased reliability and parts life. I would be interested to know their findings, but I am not privilidge to that information. It was explained to me that when you have lights and lasers attached to the M4 RAS and then exert force on the rail it causes the barrel extension to slighty move out of alignment and cause excessive wear and decrease the bolt life.
    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?

  9. #119
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    Quote Originally Posted by MK18Pilot View Post
    Exactly...

    Shoot it until it breaks.
    Or till it hits 10k.

    PM could save your life.
    We miss you, AC.
    We miss you, ToddG.

  10. #120
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    Quote Originally Posted by Magic_Salad0892 View Post
    Or till it hits 10k.

    PM could save your life.
    On top of that, if your bolt breaks while firing, couldnt that lead to other parts being damaged? Seems like driving a car till the wheels fall off instead of replacing a fixed axle... way more headache in the long run. Of course, I've never had a bolt break so I really dont know what happens when they fail.

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