Gadget Review: JP Silent Capture Spring

Silent capture spring, with stock buffer weight and spring for comparison.

Silent Capture Spring

When you start researching buffer springs for an AR15 you run across sever different springs, and buffers.  The other thing that you run across is other AR15 owners telling you that you are trying to fix a problem that doesn’t exist.  In reality, they are correct.  The traditional buffer system works as designed.  But there is one thing that many AR15 owners do complain about, the infamous “cheese grater” noise when shooting.  Anyone who has shot an AR15/M16 knows exactly what I am talking about.  It reverberates through your ear protection, and even the bones in your head.  It is downright annoying to some of us, and livable to others.  This is where a product made by JP Enterprises, INC comes into play.

Silent Capture Spring System

Silent Capture Spring System

The product is called a Silent Capture Spring.  It is an odd looking spring that totally replaces your weighted buffer and buffer spring.  The entire spring system is the size of a carbine tube.  If you have a rifle length tube, there is spacer that is placed into the buffer tube behind the spring.  The spring is actually fed onto a rod, and is held on both ends by retainers.  It is like nothing you have ever seen for an AR platform.

So what does this strange looking spring that you put into your rifle do? Well, it does a few different things for your AR.  First, it eliminates the “cheese grater” sound in your buffer tube.  There is no more annoying noise reverberating through your jaw bone every time you pull the trigger.  The second thing it does is reduce recoil, significantly.  You standard 5.56/.223 round does not have all that much recoil anyway, but there is just enough to be annoying when trying to shoot at a more rapid pace and stay on target in say a competition, or tactical exercise.  What it does it make the recoil happen in a much smoother manner, and because the spring does not allow the buffer to bottom out at the back of the stroke, it eliminates that jarring that you can get from that shock.  Also, by eliminating the buffer it removes that weight from cycling back and forth with the bolt carrier group, which in turn reduces the mass being cycled.

Silent capture spring system, with rifle buffer extension.

The third and final thing that the new spring will do with make you wonder how you ever shot an AR15 without one.  It makes everything cycle at an incredibly smooth rate.  When I installed this spring in an Adam’s Arms piston AR15, and pulled the trigger for the first time, if there wouldn’t have been a muzzle report, I would have guessed there was a misfire.  It was absolutely amazing just how smooth and quiet the rifle had become.   After many years shooting all types of firearms, in many different settings I have never been so blown away by single product.  After learning just how the new spring had changed the way my rifle shot, and adjusting to that change I noticed that my groups were tighter and my follow up shots were much faster and more accurate.

One place that you cannot use this spring system is in a solid BCG system, like a pistol caliber carbine.  The reason is that there is a guide rod that the BCG will actually over lap.  Having a solid BCG, or one with a closed back does not allot the guide rod anywhere to go, and the rifle will not cycle.  Also of note, JP engineers claim that the spring works right out of the package for right around 95% of all rifles out there.  But just in case there is a problem, or you want a more finely tuned spring, there is a spring pack sold that has varying weight springs.  You will want to read the instructions carefully on how to change the springs out, failure to follow them can lead to destroying your spring system.

Silent capture spring installed, with reduced height buffer retainer.

One positive to the system is that you can also remove the buffer retainer and retainer spring from your rifle.  This spring system will not expand past the end of the buffer tube, and removing the retainer makes removing the spring system easier to remove for maintenance.  In my rifle I actually left mine in, and sanded it down to a small nub so that it still retains the spring, but doesn’t hinder taking it out.  Because of the rigidity of this system, it is much harder to get out when there is a buffer retainer in the way.  The other thing you might find in the way when removing the spring is the hammer, you can solve this problem by releasing it, the spring will not hit the hammer when it is in the fired position.

All in all, this system doesn’t fix a single mechanical problem.  Many will say, that like so many other AR part out there, it is a solution in search of a problem.  But there is a difference between fixing a problem and upgrading.  This spring system is an upgrade, pure and simple.  It will blow your mind how smooth is makes your rifle.  My brother Chris bought one for his rifle as well, he describes shooting it as “[A] little rough at first. Like most things gun related it definitely needs to be broken in. In my experience it likes to be run really wet. Once you’ve gotten used to it, it really cuts down on the noise in the buffer tube. Very smooth operation and the reduction in recoil helps keep the muzzle down for quicker and more accurate follow up shots”

The only drawback to this system can be the price. Many I have talked to find it hard to swallow spending almost $140 on a buffer spring for an AR.  Many times I hand people my rifle and tell them to shoot it, and after that they are not only converts, they are rushing home to get a new spring for their rifle.


  • Smooth shooting
  • Reduces recoil
  • Simple install


  • Expense


  • h00dLIM

    By “cheese grater” noise, is that synonymous with the AR-15 “sproing”? If so, I am buying one first thing in the morning!

    • Cornelius Carroll

      That’s the noise!

    • Russ

      yup! Now if JP can solve the gas eye.

  • Nolan

    This seems to be a product that I do not want. That sound lets me know when my rifle is empty. The very light amount of recoil from my ar forces me to slow down and actually aim my rifle, instead of just emptying it. So it might work for some people, but I guess I’m just not operator enough to get any advantage out of it.

    • bbmg

      What, like Google +?

  • Cornelius Carroll

    Great product. I have one in a 5.45 build simply because that gun gets shot the most. Expensive? Yes. Worth it to me? Yes.

  • Yellow Devil

    Actually I don’t mind the “cheese grater” noise. It’s like an old friend, constantly complaining about life but a constant reminder that he’s right there, ready to throw down some 5.56/.223 punches when you need it the most. But if it helps with recoil and follow up shots, than well to each their own.

    • Jim Nanban

      Yellow Devil and his M4 star in… The Odd Couple. Works for me!

  • Hsein Chen

    Use heavy axle grease on regular spring, problem fixed!

    • nadnerbus

      That’s what I did years ago, and my rifle has has been silent and smooth ever since. I know some people are against it because it isn’t spec, and the possibility that the grease attracts dirt and causes a malfunction, but for civilian shooting, it has worked just fine.

  • lolinski

    I like anything that makes theg gun quieter. I have to wonder, do they have plans for something similar for the AK (because even us AK guys like quietness)?

    • dan citizen

      the AK isn’t so prone to spring noise. Part of the problem with the AR is that you have the giant slinky-type-spring riding in a tube next to your face. Also the tube itself seems to work as an amplifier.

      I can’t understand the talk about smoother recoil though. I’ve built an AR that weighed under 4 pounds and when they get that light you can actually feel the minuscule recoil offered by 5.56…

      But your average AR fans seem to think that you should fill every spot on a picatinny rail and tend to end up with rifle weights that rival a Barrett and therefore have felt recoil akin to a lazer tag pistol.

      • iksnilol

        Not because of noise, but to reduce felt recoil. Or could the same be accomplished by adjusting the gas port?

  • Vitor

    Since it reduces the (perceived) recoil, it would be very interesting to have this product tested in a 7.62 AR, where recoil is more of an issue.

    Maybe the combination of this spring system and a good muzzle brake can make a 7.62 controllalble in full auto, or one can dream.

    • mort

      Vitor JP sells an ar10 version as well. I might actually get one to try.

      Does anyone know how these capture springs work in suppressed guns? I believe there is more gas pressure and more gas/carbon released in the action on a suppressed gun.

      • Nick Leghorn has one on his suppressed 300 Blk rifle. You can search on TTAG for it, I think it’s within the last couple of weeks.

    • I actually have one for my LR308 as well. Reduces recoil a bit. But with something like a 308 round, you are still going to get some recoil. As someone stated above, which they are right about, it doesn’t reduce recoil per se, it makes the recoil sharper, and faster.

  • PCP_original

    If the same amount of gas is energizing the system then the amount of recoil will be the same as the energy will stay the same regardless of the reciprocating mass; what will change will be the cycling rate. Race guns usually run just enough gas to cycle with a normal carrier, so against common sense they run a lighter BCG and buffer in order to have some reliability, by reducing the required cycling energy. For most situations the amount of gas and reciprocating mass in an “average” AR-15 means that the gun is already cycling too fast, so either less gas or more mass is needed to tame the cycling rate. By using less gas you reduce the total energy on the system, hence less recoil, but with that your gun may not digest all ammo or handle “adverse” conditions. By putting more mass with the same amount of gas you will reduce the cycling speed while keeping the same amount of energy as a standard setup and thus have increased reliability.

    If this thing does have less mass then the recoil will be about the same, but sharper and with a shorter duration. Weird thing is that while this might be better for fast shooting some people like the slow softer recoil of heavier provided by heavier set up like an M16 BCG with an A5 buffer. If you don’t have an adjustable gas block, is using a carbine BCG and a carbine gas system (or worse, a piston kit) then you might run into problems with some magazines (specially those with weaker or worn out springs) as they may not feed fast enough to keep up with the BCG.

    • sianmink

      the main difference in the recoil impulse is you don’t get the ‘slap’ of a standard buffer hitting the back of the tube, you instead get a constant force as the recoil is absorbed. With a standard buffer you essentially get two impulses: the initial recoil and then the buffer bottoming out in the extension tube.

      • Suburban

        I got that from the article. The thing is, the “slap” of the buffer in the tube means that you have some leeway for lighter loads. I wonder how many AR rifles would function with my weak batch of Tula 55gr ammo, and the JP Silent Capture buffer spring system.

        The AK-47 is going to be an overgassed rifle, if manufactured to military specification. This is done to ensure reliability, when you run into a weak batch of ammo, or sand or mud in the moving parts of the rifle. The downside is more felt recoil.

        “Everything is compromised.”

  • Lance

    Hate to say but hydraulic and none spring buffer assembly’s been around in the AR-15 world for year now. Looks nice if you cant stand a spring noise when firing.

    • Suburban

      Not really the same thing, as most hydraulic buffers that I’ve seen are still used with standard buffer springs.

  • schizuki

    Not sure if I would change anything in a fully functional rifle just to reduce noise.

  • Tpa Gunslinger

    This story may have stemmed from a comment I left on a post a few weeks ago.
    I must confess that I was misinformed by a high ranking company official about our use of variable buffer springs.
    It was a day or two after I posted when said official showed me the JP buffer spring that he considered progressive.
    This buffer spring set up is NOT a progressive assembly. Thus, we are still yearning for the ever-elusive progressive spring.

  • Fox218

    I never noticed it while I was in the army. Came home, built my own and its audible but it doesn’t bother me.

  • JT

    So will this optimize 3D printed guns?

  • Westwood

    What the heck is a sever spring?

  • lbeacham

    No good for SBR’s.

    • M.Dover

      since when ? You need to get informed and stop posting until you do. These work just fine in an sbr. if you have cycling problems with your sbr and this buffer you have a gas problem not a buffer problem.

      • lbeacham

        I have several of these buffers, some experience. When I encountered varied results with common ammo, I contacted JP and was told different spring rates they sell might help but their own experience with SBR’s (mine is suppressed) proved finicky. I did impove the reliability with M193 55gr. by swaping springs but it balked when used other .223 ammo. With the JP rep. being helpful but not confident there was any other easy solution, I fell back on the stock carbine buffer/spring, which was 100% reliable. My eventual solution at improving the “feel” was the Vltor A5. It also provided additional LOP I find occasionally useful. I swithched all my AR’s to the A5. I am only an expert at what I like and require. If you’re making a living selling the JP buffer, it worked perfect in my 18″ rifle length AR. If this is just you two cents, shut up.

  • Keith

    How about just buying a smoother buffer tube? I had one tube that had very minute ridges on the inside, sounded like my rifle was going to crank and drive off. Found better, perfect finished tubes, cant hear a thing except for the bolt cycling. Could just be me.