Henning Smith & Wesson M&P Magazine Extension for USPSA

The Henning Group Magazine Extension Kit for Smith & Wesson M&P 9mm increases magazine capacity from 17 to 23 rounds!  The design of this extension is a true extension of the internal shape of the factory magazine tube. Combined with a stainless steel, 13-coil magazine spring it is a proven and reliable solution. This Smith & Wesson M&P 9mm magazine extension is CNC machined from 6061-T6 billet aluminum. This extension fits the USPSA 141.25mm gauge, and is legal for Carry optics, Limited Optics, Limited & Open divisions in USPSA. 

The latest design includes numbering dots, serrations for light side grab and a reinforced wall thickness. 

Works with all magwells Henning has tried, including the SPEC SERIES V M&P 9 METAL HD

Factory spring and follower yields 23+1, but an extra power spring ensures proper function.

MBX and Rune Tactical Aftermarket Follower Kits increases capacity from 17 to 24 + 1 and do NOT LOCK slide back on empty.