This magazine is made of POM plastic and fully compatible with aftermarket airsoft guns taking M4 magazine. The capacity of this magazine is 300rds and the internal compoments of the magazine are imported from Japan. Extremely smooth loading of the BB means no re-wind is necessary after one full wind up.

High Quality internal compoments imported from Japan
No Re-wind is needed *** (One full wind up will allow you shooting all BB bullet out!!)
Fully Compatitible with Aftermarket Airsoft Guns taking M4 Style Magazine
It fits APS M4 and UAR