Black dogs rugged polymer X-form 

We just got 6 of the 50 round drums for the mil spec AR22s in and for the smith and wesson M&P22s 
magazines for the 22rf ARs available in 10 15 and 25 round capacity with either glass filled or metal feed lips and will feed in a variety of 22 semi autos but not the S&W MP15

Black Dog X-Forms Magazines .22LR