Mark 4 tactical bases and rings are the strongest of all Leupold mounting systems. The one-piece base features a built-in 15 MOA or 20 MOA slope for long range shooting. Both 6-48 shoulder screws and the larger 8-40 screws are included to accommodate high recoil applications. Strong 1/2" keeper nuts lock the rings solidly against the one or two-piece bases, or any Picatiny-style rail.
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