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The length of the spring is inconsequential to the carrier contacting the reciever. The buffer length and buffer tube length are what controls the rearward movement of the carrier.Upon further inspection, I think my spring may be the issue.. Its 10.5 inches with 25 coils which is shorter than any dpms style 308 spring I can find and has fewer coils. That'd cause the carrier to crash into the front of the extension. I measured the buffer and tube as well, those look fine. 7" on the tube and 2.5" on the buffer. That spring has me scratching my head though. I might order an orange spring from sprinco and see what that does?