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Product no.: 452000119
Mfr. No.: JPS-OSC
812872020921 Precision centerless ground and polished operating springs offer a smoother and quieter operation in AR buffer tubes. Improved impulse feel results in faster sight recovery and improved reliability. Outer-diameter is ground and polished for smooth, quiet movement in the buffer tube. Rifle fits fixed stock rifles with A1/A2 buffer tube. Carbine fits collapsible M4-type carbine-length buffer tube. 308 Rifle – Fits AR10 and 308 AR fixed stock rifles with an A1/A2 buffer tube. 308 Carbine – fits AR10 and 308 AR carbine buffer tubes. JP Enterprises recommends the use of JP Tuned and Polished 308 Buffer Springs when using the JP 308 Low Mass Bolt Carrier Group
Works well, but short life. 16/07/2018
Very nice part, but low life expectancy. Did not see anything on JP's site or anyone mention on here, but on the card I got with the spring the recommended replacement is only 5,000 rds. I don't consider my self to shoot much, but 5k rds comes quick and was disappointed to see that after I got it. That said it works very comparably to the flat springs I have and have yet to hear any spring noise when firing.
IT WORKS! 28/04/2017
Built an AR308 with a standard 308 carbine buffer spring in a Magpul CTR stock. Would only lock back the bolt carrier about 50% of the time after the last round. Installed this spring and now get lock back after the last round 100%. Used a standard 3.7oz buffer both times. Problem solved!
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