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The Osprey Defense Gas Piston Conversion System for the M4 / AR15 / M16 rifle.

18 Photos

Step by step installation photos of the Osprey Defense OPS-416 on a standard Colt M4 rifle. Entire process takes only a few minutes. First time installations typically take 6-7 minutes, once you've done it, you'll probably be able to accomplish everything in about 4-5 minutes or so.

87 Photos