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Old 03-23-2019, 04:10 PM
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17 Mach 2 10/22 bolt experiment



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A few images from my bolt experiments, version 1:









It came out about 30 grains lighter than I hoped, but with a heavy KIDD spring and/or a magnum trigger spring, I think it'll work fine.

We learned a lot in this machining process. I have an improvement lined out that will get the weight correct and not require machining the tungsten around the firing pin.

I'll update this thread once I get them shooting.
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Old 03-23-2019, 09:35 PM
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That looks great. Love mine, but a eabco weighted handle kit. Would love to try one of yours sometime. Been looking for a second barrel, maybe for charger as well.
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Old 03-24-2019, 09:11 AM
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Thanks. I've been talking to my machinist buddy about costs to do batches of 10, 15, 20 bolts. If there's enough interest, I could get something going...

BUT FIRST we need to ensure they run flawlessly and lock the design.
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Old 03-24-2019, 11:06 AM
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that looks good, was it done a bridge port ?
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Old 03-24-2019, 11:09 AM
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since you have a machinist, why don't you just mill the bottom of the bolt off and use that space for tungsten, like Volquartsen did
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Old 03-24-2019, 11:17 AM
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Definitely interested, please keep me in loop.
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Old 03-24-2019, 05:23 PM
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Wire EDM.

We considered the VQ bolt, but then the problem is how do you attach the tungsten? I don't like screws. No one I've talked to who works on these bolts likes screws. Randy at CPC suggested circular slugs of tungsten, pressure fit and epoxied, which we did.

The next version will be similar, but with a wider, fatter square slug to get the weight up and away from the firing pin channel.
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Old 03-25-2019, 09:44 AM
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I can’t think of any big failures by VQ in quality. You probably can’t use cheap bolts. But, if VQ used them they will work and work well. Engineering is something they do well. They probably used some loctite too.
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Old 03-25-2019, 10:00 AM
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Interested also as to what you come up with. Looking for my 1st HM2 and not many options except used. CZ452 is first choice and a barrel/bolt setup for a 10/22 second.
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Old 03-25-2019, 10:53 AM
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Quote:
Originally Posted by m17hm2 View Post
Wire EDM.

We considered the VQ bolt, but then the problem is how do you attach the tungsten? I don't like screws. No one I've talked to who works on these bolts likes screws. Randy at CPC suggested circular slugs of tungsten, pressure fit and epoxied, which we did.

The next version will be similar, but with a wider, fatter square slug to get the weight up and away from the firing pin channel.
you could always machine a dovetail into the bolt to hold your block of tungsten...then it could be held in place with a roll pin
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Old 03-25-2019, 11:08 AM
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btw, anyone know the total weight of the VQ bolt?
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Old 03-25-2019, 12:55 PM
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7.84 oz w/o the charging handle
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Old 03-25-2019, 01:08 PM
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I think the vq bolt with tungsten weight is 8.6oz.
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Old 03-25-2019, 07:54 PM
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Old 03-25-2019, 08:11 PM
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my mistake 7.76oz typing on my phone. there is some difference weight?
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