The MP5 Mag Kit is the perfect modification for A-5 owners. The placement of this magazine is set closer to the trigger guard giving it the most authentic MP5 magazine look on the market. This magazine is made of a high grade polymer that will not weigh you down yet maintains strength and toughness. This kit is compatible with both regular A-5's and the new External Selector Switch E-grip upgrade, as long as the serial number on your A5 is 524999 or less. Markers with serial numbers higher than 525000 will have to get the new 2011 style MP5 Magazine, as the trigger frame is slightly different.