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by greenfox37, from MI, United States Asked on March 25, 2020
These springs are for use only with the JP Enterprises SCS (Silent Captured System), however the SCS itself is designed to fit in carbine tubes, as well as rifle tubes with the included polymer spacer. The springs will not work using a standard buffer.
This is an Auxiliary Spring Rate Kit for the JP Silent Captured Spring - these springs are not meant to be used with standard carbine or rifle buffers.