The J P Enterprises .308 AR Alternate 3-Spring Pack is a tuning accessory from J P Enterprises (brand part no. JPSCS-PACK10) built for owners of the JPSCS-10 Silent Captured Spring system on the .308 AR (large-frame) platform. It includes three alternate action springs of different rates, giving a shooter the range to match spring tension to a particular .308 Winchester load or gas system length. Retuning spring rate inside the captured-spring assembly changes bolt carrier velocity, which affects both felt recoil and reliability in a large-frame AR build.

Key Specifications

• It supplies three alternate springs of different rates for retuning a JPSCS-10 Silent Captured Spring assembly.
• It is built specifically for the JPSCS-10 system, matching J P Enterprises’ .308 AR (large-frame) captured-spring platform.
• Changing spring rate lets a shooter adjust bolt carrier velocity to suit a given .308 Winchester load.

Frequently Asked Questions

Does this fit the AR-15/M16 JPSCS-15 unit? No, this pack is sized for the JPSCS-10, J P Enterprises’ captured-spring assembly for the .308 AR large-frame platform.

What does swapping the spring accomplish? A different spring rate changes how quickly the bolt carrier cycles, which lets you tune felt recoil and reliability to a specific .308 Winchester load.

Buy the J P Enterprises .308 AR Alternate 3-Spring Pack for JPSCS-10

Order the J P Enterprises .308 AR Alternate 3-Spring Pack for JPSCS-10 through our rifle parts selection at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop.