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That gritty "spoon over a cheese grater" sound every time your AR cycles? This is the fix. The JP Silent Captured Spring is a self-contained buffer and spring assembly that replaces the loose buffer and spring in your extension tube, cutting out the friction, vibration, and metallic twang that standard setups are known for. Maxim Defense had JP build this one specifically for the CQB Stock System, and this listing is the heavy-weight version running tungsten and stainless steel components for extra reciprocating mass.
The added weight is the whole point of the heavy configuration. More mass on the buffer end slows and softens the bolt's rearward travel, which smooths out felt recoil and keeps the sights steadier for faster follow-up shots. Paired with the quieter action of the captured spring, you get a rifle that feels more refined and settled when you're running it hard. The tungsten and stainless build also holds up to serious round counts without complaint.
This is a purpose-built part, not a universal drop-in. It's made to work with the Maxim Defense CQB Stock System only, and it requires an open channel in your bolt carrier group so the guide rod has room to pass through during the cycle. If your BCG isn't already set up with that channel, this spring won't function correctly. Worth confirming your carrier is compatible before you order.
One thing to keep in mind: JP does not recommend the SCS for select-fire applications, and you shouldn't modify a BCG to force compatibility. For semi-auto CQB-equipped builds where everything lines up, this is the factory-intended way to quiet things down and add mass in one clean package.
It replaces the standard loose buffer and spring with a single captured assembly that cycles smoother and much quieter. You lose the raspy metallic twang from the extension tube and gain reduced friction and vibration during fire. The heavy version adds tungsten and stainless mass to further soften felt recoil and steady your sights for follow-up shots.
No, this one is built exclusively for the Maxim Defense CQB Stock System and is not a universal AR drop-in. It also requires a bolt carrier group with an open channel so the guide rod can pass through as the action cycles. Confirm your CQB stock and a compatible BCG are in place before ordering.
The heavy version packs more reciprocating mass thanks to its tungsten and stainless steel construction. That extra weight slows the bolt's travel and smooths out recoil, which many builders prefer for a settled, controlled feel. It's a good pick if your setup benefits from increased buffering mass.
JP does not recommend the Silent Captured Spring for select-fire applications. This part is intended for semi-auto CQB-equipped AR builds. You also should never modify a bolt carrier group to force compatibility, since the guide rod channel needs to be there by design.
| UPC | 680017475710 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXM47571 |
| Color | Black |
| Model | |
| Product Type | Capture Spring |
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