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[What spare parts, high wear items, should one have on hand for the SP 89 Bolt, for the bolt assembly, and rest of gun, and which rollers are the correct ones. I have the orig. flat faced bolt head, that came with the SP 89, and I also have a new, Action 3 bolt head, as a spare. First, do they take the same size rollers, and retaining clip? Next, what other items are a MUST HAVE, as far as spare parts go for the SP 89 (springs, pins etc)?