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What is the difference between the standard and modified op rod? — 1 Answer

by aurelius, from RI, United States Asked on October 23, 2019

Name Osprey Defense AR-15/M4/M16 Gas-Piston Conversion System (5)
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Answered by Ethan C., Gear Expert, from IL, United States, on November 03, 2019

The regular op-rod measures 6 3/8”. The modified carbine op-rod is exactly the same length, but the shaft (the black portion) is 2 5/16” long while the regular Carbine shaft is 2 25/32”. The modified rod allows for more travel when using a free-floating hand guard’s wider barrel nut.

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Last updated 2025-11-12 UTC.