A VERY GOOD QUALITATIVE POLYMER MADE MAGAZINE WITH A CAPACITY OF 150 BB'S.
THIS IS OF COURSE BEST SUITABLE FOR THE KRYTAC M4 REPLICA.
THE CLEAR PIECE ON THE SIDE SHOWS HOW MANY BB'S ARE INSIDE.
Note that with every magazine it can happen that the BB's do not feed properly on a certain brand of replica.
The advice is to try a different brand of magazine, in order to solve the problem.