I spoke with the folks at Spikes. The upper was designed to be run in a carbine gas tube with an H buffer. They hadn't had any experience with running it on a rifle tube/buffer setup (since most states don't have NJ's retarded gun laws). I think my best bet will be, assuming my current setup has more hiccups than the one yesterday, to get the buffer spacer and run a carbine spring/buffer setup.



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