Adams Arms Drop-In Piston Conversion Kits For AR-15 Carbine
Contains our 1 piece bolt carrier, handguards and handguard cap. The Adams Arms Gas Piston System is an end user installed after-market product for Mil-Spec ARs.
It will fit on any AR barrel with a .750" or 3/4" diameter at the shoulder where the front sight base sits. The Carbine version will work on barrel lengths from 10.5" to 16" that has an existing carbine gas system. See the FAQ section for the measurements of a carbine gas system.
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