Review: KynSHOT hydraulic recoil buffer RB5000

[CouchOperator]

Fact, I don't care what you have to say.

Fact, you said "I know". So i asked. This is, after all, a discussion board meant to share info with other members. Im asking for the science behind your information.

[1snowridr]

Fact, you said "I know". So i asked. This is, after all, a discussion board meant to share info with other members. Im asking for the science behind your information.

http://www.thetruthaboutguns.com/2014/11/jeremy-s/556-muzzle-device-shootout/

http://www.thetruthaboutguns.com/2015/04/jeremy-s/ar-15-muzzle-brake-shootout-2/

[AregularGuy]

I'm sorry, but your understanding of physics is flawed. Unless I am misunderstanding your statement, this claim violates Newton's Third Law, as well as the First Law of Thermodynamics. Conservation of Momentum, and Conservation of Energy. Momentum cannot be converted into heat. Energy cannot be created or destroyed. I strongly suggest you review the concept of "free body diagrams".

I urge skepticism of the greatest possible order with this product, based on your (and the Kyntec Director's) description.

https://www.google.com/patents/US4476969

The above is another example of a recoil buffer patent demonstrating poor understanding of harmonics in a two DOF mass-spring-damper system, and the nature of impulse attenuation. (Not "kinetic energy", as you describe.) Impulse is the integral of force over the time it acts. This is highly dependent on the rifle configuration, ammunition used, cartridge pressure, etc. Much scrutiny is required of these claims. This enters the realm of system and control theory.

A great amount of work was done by Stoner (and other designers) to attain the level of reliability of what we have today. This is specifically why they use such proven, reliable methods (such as springs, tungsten powder, free-floating weights, etc) which you and KynShot are so quick to denounce. Is the potential impulse modulation worth risking a hydraulic seal that will fail at an unknown point in time? Perhaps the application is different, but it bears to keep that in mind.

"Recoil" is the attenuation of this impulse. It falls to the inventor of this device to demonstrate the correct parameters were used. Here is an example of "proper math"; I'd like to see KynShot's.

SAE LaCroix Defence Samorai UFW (Urban Fighting Weapon)

https://www.youtube.com/watch?v=HyAl9qK3Rlg

http://www.securityarms.com/forums/showthread.php?t=545

http://www.lacroix-defense.com/

This sounds more science-y than the op. I believe it.

[haza12d]

I've own a couple of these, the RB5000 and the RB500L.

I had issues in the beginning where the bolt won't lock back on the last round. It turns out that they are a little bit longer than your standard buffer when fully compressed. I'm not sure if they have addressed this issue in their recent production models.

I was able to fix this problem by replacing the end of the buffer with couple of bibb washers that put its overall length the same as the standard buffer.

I'm currently running a Sprinco Extra Power Spring along with the Kynshot buffer and I have been pretty happy with the results. Very little recoil when coupled with a quality brake, I'm running a Phase 5 Fatman and M4-72 on my rifles. I've had no malfunctions of any kind with this setup for over 1K rounds on one AR and just a little less than 800 rounds through another.

It does reduce felt recoil but not by a whole lot. If you have money to blow, go pick one up. If not, you're better off spending the money on a quality brake.

Check out my feed on IG: the_fob_of_war

[Dezrat]

Don't believe it. Question it. Seek evidence and determine it yourself.

I'm not saying this device does not work. Or that it doesn't have a perceptible difference in feel. I'm just saying the explanation as I read it above doesn't make sense.

I suggest you wait until KynShot publishes some math or proof or details or impulse loading curves before making a decision.

http://www.defensereview.com/hydraulic-recoil-buffers-for-the-tactical-ar-15m4m4a1-carbinesbr-friend-of-foe-from-the-enidine-recoil-buffer-to-the-kynshot-recoil-damper-and-crosshair-buffers/

https://www.youtube.com/watch?v=YwvcWgNBu2Y

PS: OP is just copying+pasting this post on multiple forums. Can you say, "sponsored posting"?
http://ar15armory.com/forums/topic/1...buffer-rb5000/

What's the old adage? "If you can't dazzle them with brilliance, then baffle them with B.S."
Same post on Arfcom too.

[CouchOperator]

Same post on 1911forum as well

https://forums.1911forum.com/showthread.php?t=766954

And M4Carbine

http://www.m4carbine.net/showthread.php?195009-Review-KynSHOT-hydraulic-recoil-buffer-RB5000

[MarikinaMan]

I work on suspension and hydraulics. I can say that I know a thing or two about damping systems.

I betcha it works. A steel spring is known to be linear in terms of force. A hydraulic damper can be made to be progressive. Since the Kynshot damper actuates when the buffer bottoms on the tube, one can surmise that it will reduce bottoming of the buffer on the tube. If it is sufficiently damped, almost eliminate it.

How much u ask? Depends really on the dampers tune.

I would venture to suggest, an appropriate polyurethane bumper inside the buffer tube can come close the same effect.

Gotta love innovation. Looks interesting.

[CouchOperator]

Colt abandoned a hydraulic buffer design over 20 years ago.... Not really any innovation going on here... Plus it looks a LOT like the Enidine product.

[Dezrat]

[QUOTE=MarikinaMan;19880855]I work on suspension and hydraulics. I can say that I know a thing or two about damping systems.

I betcha it works. A steel spring is known to be linear in terms of force. A hydraulic damper can be made to be progressive. Since the Kynshot damper actuates when the buffer bottoms on the tube, one can surmise that it will reduce bottoming of the buffer on the tube. If it is sufficiently damped, almost eliminate it.



You nailed it Marikina, and that is all that is going on with it, it damps the violent strike at limit. The attempts to drag in the "fantasy Physics" in my view are an attempt to make it sound like it's doing a whole lot more than that. Why not just accurately say what it actually does. People would still yet be interested in it.

[xxINKxx]

These have been around for awhile.

I have the new brand kynshot in my 308 AR build (dpms pattern). Mainly got it because for whatever reason every website for months on the entire internet was out of stock for US made rifle length buffers for 308 when i was building my gun....Brownells had this so figured ide get something fancy since its in stock. Works flawless. I have no idea if it helps anything as far as recoil as this is my first 308 AR build. Dropped the buffer in with one of those fancy strike industry recoil springs and it cycles fine with mil spec 7.62x51/308 ammo. Pleasant feeling on my shoulder. I probably wouldn't buy it again as its pricey, and standard equipment works nearly the same for the most part and cheaper, reliable...Hydraulic buffers are known to leak.

Ive had a buffer technologies enidine hydraulic buffer in one of my 556 ARs since like 2008 and its ran fine all these years. Shoots fine, but doesn't shoot any better then my ARs with normal standard stuff.

Honestly save youre money and just run standard stuff, or even like a spikes st-t2 buffer

[jetspeedz]

1snowridr: Yes it really does work well in conjunction with a good break. Glad this worked out for you as well as it did for me.

CouchOperator: I'm a member of many different forums and yes I share my reviews on all those forums related to firearms products. I explicitly state in my Youtube video to click on the video description to access all the different forums for which ever you are a member of. I have been sharing all my reviews the same way for years, nothing new, and no I don't work for any of the companies I review products.

CitizenOne: I suggest you read my statement again, it is correct, no where in my review was there any mention of 'energy being created or destroyed' . If you wish to contact me direct for clarification please do so, I believe there has been enough details and Physics discussed on the subject matter.

MarikinaMan: Correct very similar, however this is a compression stroke only style shock.


haza12d: I'm curious did you actually mean the are shorter and you added the washer to extend the length? I don't have any problems with this buffer and it was worked flawless but I'm also using this in a finely tuned system with adjustable gas block (review coming up) as well as custom tuned JP spring.

Cheers