Standard Carbine Length Buffer Spring. Works with 223 or 9mm. (9mm Still Requires a Heavy Buffer)
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Works great and received it fast no complaints
Very nice spring. Using it with the RRA 9mm buffer.
Using this spring in a AR9 build and it works great with the Spike's Tactical ST-9X.
Combined with the heavy buffer, this spring makes my 9mm build function smoothly.
I'm using it with the ST-9x sold here also