This Smith & Wesson extension adds 6 rounds to your magazine. Easy assembly. Made to match our S&W magwell. Works on All double stack M&P Mags 9mm and 40. If you do have a .40 it will only be a +5 extension. Some 9mm mags will only fit +5 until they wear in. The 6th will be very tight.
Stock springs will work just fine most of the time. If stretching your stock spring (according to the install video) does not work you may need the extra coil S&W Wolff spring we offer. Please see related items below
Black hard anodized aluminum. Please note that all our parts are sent in batches to anodize. Each batch may vary slightly in shade of black or color. Thank you for you understanding.
bases and extensions WILL have problems
when dropped repeatedly on concrete. They are Hard Anodized, but they are still
aluminum parts that will take on damage. When installing the extensions, only
tighten the back plates down until secure. The plate may crack or break if
tightened down too much.
MADE IN THE USA
DOES NOT WORK ON FACTORY 10RD MAGS - DOES NOT WORK WITH COMPETITOR FACTORY MAGWELL.
KNOW YOUR STATE AND LOCAL LAWS
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