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Posted: 1/16/2015 7:55:38 PM EDT
[#1]
Thanks, that was great. Good info and comparison
I was set on the ADAMS kit, and it has some great features, but Im leaning towards the Syrac kit now. Mainly for compatibility with the MEGA MKM upper I'm using for a pistol build. I think the full size ADAMS kit; the one with a railed gas block is the best gas block design (ease of stripping and adjustment), but for the low profile setup; Syrac has the advantage. I am interested to see how the Syrac spring holds up under what is likely to be a very hot environment. Adjustment seams a bit over-customizable at the expense of ease of use. I can agree with Poster on the simplicity and repeatability of the Adams kit adjustment. |
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Posted: 1/17/2015 11:14:26 AM EDT
[#2]
Syrac has the advantage in compatibility. The spring exposed to the hot gases is still a question to me. The CMMG piston kit also used a captive piston with a spring exposed to the gas like the Syrac kit. Their spring is longer and heavier, and they also recommended periodic changes, at 7.5K rounds, I think. I'm not sure CMMG still offers their piston kit. I bought several extra springs when I got the CMMG piston. The CMMG runs good but is heavy. I am going to build the Syrac kit with a megalithic upper and put it through its paces with my M16 lower.
http://youtu.be/pNYK_8oFcss |
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Posted: 1/17/2015 11:20:32 AM EDT
[#3]
But wouldn't the the system still function if the spring was removed? Like the osprey kit and also I seen a few users of the Adam arms kit remove the spring
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Posted: 1/17/2015 11:51:11 AM EDT
[#4]
I am sure it would still cycle. The question is, would the piston head battering the inside base of the cylinder that retains it cause excessive wear. Since it was not designed without the spring I would think this would occur and lead to early failure. The engineers will have to speak up on this.
http://youtu.be/pNYK_8oFcss |
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Posted: 1/17/2015 9:00:32 PM EDT
[#5]
Quote HistoryQuoted:
I am sure it would still cycle. The question is, would the piston head battering the inside base of the cylinder that retains it cause excessive wear. Since it was not designed without the spring I would think this would occur and lead to early failure. The engineers will have to speak up on this. Its extremely unlikely the absence of the piston spring would cause premature wear. During firing, the force of the gas pushing back on the piston is hundreds of times greater than the force of the spring, so the piston is going to be "battering" the piston housing even with the spring in place. The shot-to-shot variance in gas pressure is more than the pressure (or lack thereof) of the spring. All the piston spring does is keeps the piston rod from clunking around by gravity when you tilt the gun up or down, and that's only really a factor when the bolt is locked back. The bolt coming forward will force the piston to the forward position between shots even if the piston spring is gone. |
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Posted: 1/20/2015 8:57:01 AM EDT
[#6]
Quoted:
I tried to measure and review the design and function differences between these two kits. Which characteristics do you guys value the most. Are there other functional or design differences that I missed between these kits. DISCUSS! http://youtu.be/pNYK_8oFcss Has anyone used either of these system in a build and gotten any significant trigger time with them? Can you share your experience? Anyone out there used both and can give us a function review or comparison? Thanks! Mike |
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Posted: 1/20/2015 11:02:40 AM EDT
[#7]
Thanks for the comprehensive video review.
Also thanks for getting right into the meat of the topic without 10 minutes of side ramblings <cough Nutnfancy cough> ... hahaha. |
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Posted: 1/22/2015 6:17:19 PM EDT
[#8]
Quote HistoryQuoted:
I am sure it would still cycle. The question is, would the piston head battering the inside base of the cylinder that retains it cause excessive wear. Since it was not designed without the spring I would think this would occur and lead to early failure. The engineers will have to speak up on this. http://youtu.be/pNYK_8oFcss Quote HistoryQuoted:
I am sure it would still cycle. The question is, would the piston head battering the inside base of the cylinder that retains it cause excessive wear. Since it was not designed without the spring I would think this would occur and lead to early failure. The engineers will have to speak up on this. http://youtu.be/pNYK_8oFcss From another thread: Quoted:
From other pictures I have seen, it looks like the compression spring is housed inside the piston cylinder/gas block, the heating and cooling of the spring will likely cause it to fail. Quoted:
Regarding heat, the weakening/failure of a compression has nothing to do with heating and cooling. The issue is the temperature the spring heats up to. As long as the temperature does not reach the tempering temperature of the spring material there will be no negative effect on the spring. We chose a spring MTRL that has a tempering temp. that is higher than what a rifle's temperature will reach with continuos full auto fire of 480 rounds. That is 16 30 round mags. At that point you are starting to degrade the barrel. If you want/need to fire full auto continuously for more than that you should get a HMG (i.e. 240 or the like). If you have deep pockets get a mini gun. :-) We have done extensive testing over the last year during the development of this system. We have fired thousands of rounds on the spring full auto. We would not put out a product that would fail. We have a lifetime warranty. The only function of the spring is to return the rod back to it's static position (pre-firing). You can run the system without the spring if you are worried about it. Yes, we have run thousands of round without the spring in the system. I assure you there is no issue with the spring. V/R, Jason Adams http://www.ar15.com/forums/t_3_126/658707_Syrac_Ordnance___.html |
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Posted: 1/29/2015 9:26:45 AM EDT
[#9]
Quoted:
I tried to measure and review the design and function differences between these two kits. Which characteristics do you guys value the most. Are there other functional or design differences that I missed between these kits. DISCUSS! http://youtu.be/pNYK_8oFcss So the spring being up front appears to be a non issue. Since the piston/rod and spring come out through the front, this would allow for easy maintenance and replacement or removal of spring if necessary. |
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