Now available in a convenient 3-pack, the new ST60 RM4 ERG mag has the ability to change capacities from 30 to 60 rounds, allowing the user to train with a realistic round count, or to dominate the airsoft field. These mags fit the original PTS RM4 ERG Series as well as the new RM4A1 and RM4 KR Series ERGs, and feature a new, user-friendly capacity switch on the bottom of the magazine!

 

 

 

Weight 1.5 lbs
Dimensions 8.5 × 4 × 4 in