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General More on the JPSCS FAQ

JP Custom Buffer Springs and Silent Captured Springs

The “spoon over a cheese grater” sound emitted by modern sporting rifles whenever they’re charged or fired has always been one of the AR platform’s ugly blemishes and one we’ve worked ardently to eliminate.  After years of specially selecting buffer tube manufacturers based on the quality of their tubes’ interior finish, we opted to design and produce our own action springs with a perfect centerless-ground and precision-polished outside diameter.  These JP Custom Buffer Springs are an inexpensive way to see exactly why we have a reputation for having the quietest, smoothest rifles on the market.

Our pursuit of perfection didn’t stop with springs though and led ultimately to the creation of the JPSCS™ Silent Captured Spring (patented) in 2012. Maintaining all the benefits of our polished buffer springs and proprietary LMOS™ buffer, this combination buffer-spring assembly eliminates the friction of standard buffer components resulting in outstanding smoothness and sound abatement. What’s more, the spring is removable from the assembly for custom tuning, and both the AR-15 and AR-10 versions of the JP Silent Captured Springs are functional in rifle- and carbine-length operating systems. The AR-15 version fits and functions in any gas-operated AR-15 variant, regardless of caliber and the AR-10 version should fit and function in any large-frame AR-10-type platform. The JPSCS is not compatible with any 9mm AR variant or any blowback system using a solid (weighted) carrier.

Silent Captured Springs
JPSCS-15AR-15 Silent Captured Spring

Standard or Heavy Tungsten
JPSCS-15KJP Silent Captured Spring Builder Kit with Alternative Spring Pack (AR-15)

Standard or Heavy Tungsten
JPSCS-10AR-10 Silent Captured Spring

Standard or Heavy Tungsten
JPSCS-10KJP Silent Captured Spring Builder Kit with Alternative Spring Pack (AR-10)

Standard or Heavy Tungsten
JPSCS-9MM9mm Silent Captured Spring$149.95
JPSCS-HMTungsten Weight for JP Silent Captured Spring$16.95
SCS Auxiliary Spring Rate Kits
JPSCS-PACK15Alternate spring pack for JPSCS-15

5 Alternate Spring Weights
JPSCS-PACK10Alternate spring pack for JPSCS-10

3 Alternate Spring Weights
Buffer Springs
JPS-OSCCustom Centerless Ground and Polished Operating Spring
Platform: Small-Frame
Length: Carbine Length
JPS-OSRCustom Centerless Ground and Polished Operating Spring
Platform: Small-Frame
Length: Rifle Length
JPS-OSC.308Custom Centerless Ground and Polished Operating Spring
Platform: Large-Frame
Length: Carbine Length
JPS-OSR.308Custom Centerless Ground and Polished Operating Spring
Platform: Large-Frame
Length: Rifle Length
JPLMBJP Low Mass Buffer
for AR-15-type rifles

Silent Captured Spring

One of my pet peeves is the sound of a wood rasp coming from my rifle. I find it totally intolerable, even though it is the normal sound of rifles from every other manufacturer. Over the years, we have spent a great deal of time hand prepping our action springs and extension tubes to get that near-silent, glass-smooth feel to our actions. Anyone who owns a JP rifle knows exactly what I mean since it's the most pronounced and immediately noticeable difference the first time someone handles and cycles one of our rifles; the operating system honestly feels like it's running on roller bearings. It's this obsession that we've taken to its natural conclusion after a couple years of thought, design, prototyping and testing our JP Silent Captured Springs (pat. pend.).

The best way to describe the results of this innovative system is the complete absence of mechanical feedback from the operating system under live fire and a smooth, silent feel to the rifle when you charge or manually cycle it. No rough, raspy sound or feel. No twang or vibration from the spring during live fire, just the beautiful sound of silence. Even in a very rough extension tube, the rifle runs smooth since the spring never contacts the tube, running instead on a guide rod similar to a 1911 guide rod system.

If you've followed the history of ARs, you probably remember the craze for pneumatic AR-15 action systems several years ago. Those pneumatic systems also made for a silent, smooth running rifle, but they had some fatal flaws that the new JPSCS effectively avoids. First, they stop working in the cold due to a little thing called Boyle's Law. The new JPSCS uses an old-fashioned, reliable spring system that works under any conditions and has an innovative buffer system that rides the guide rod with the carrier.

The second problem with the pneumatics is that they didn't have the dead blow hammer effect of a true buffer system. An AR-15 without a buffer is a malfunction waiting to happen. The dead blow hammer effect of the buffer is essential to preventing bolt carrier bounce resulting in ignition failure on account of the hammer impacting the firing pin while the bolt is not fully in battery during rapid fire or full auto fire. The buffer also increases the reliability of a rifle by "hammering" the carrier forward to press the action fully into battery even when the chamber is fouled. In the JPSCS, the buffer itself is "captured" in the assembly providing all the mechanical functionality of a standard buffer retainer plunger but with the fringe benefit of greater ease in cleaning and service that comes with a simple drop-in part like the JPSCS.

The JPSCS system is available for both AR-15 and LR-308/AR-10 systems equipped with carbine-length stocks and includes a spacer to allow fit and function in rifles with full-length stocks and extension tubes. Thanks to ease of assembly/disassembly, we will also be offering substitute spring kits with a variety of spring rates to let you experiment to find the rate best suited for your particular setup.

I'm already switching every rifle I own over to JP Silent Captured Springs, so don't be surprised if you do the same once you've tried one.

Will the JPSCS work in either a full-length or carbine stock?
Does the JPSCS replace both the buffer and buffer spring?
Yes, a polymer spacer is required and included for rifle-length systems.

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