Our true bolt action uppers will run with or without a buffer and spring. The rear of the bolt does extend into the buffer tube 5/8″ to 1″ depending upon caliber, so that amount of travel is needed. Lowers like the BRN-180 or Sig MCX would not be compatible as they don’t allow the bolt to fully travel to the rear during cycling. If you want to run a folding stock, we would suggest the Law Tactical folding stock adapter.
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