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 the new 2011 Tippmann A-5's (with Serial Numbers 525000 or higher, regardless of if it's basic trigger frame, response or Hall Effect Electronic. If your Tippmann is 524999 or lower, you'll need the older-style magazine.