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The only S&W models that have M4 Feed ramps are The M&P Sport ll's. The last spec sheet I sent was for the Windham R16M4A4T "MPC"
The 4150 is the correct cmv.
M&P SPORT II - FEATURES AND BENEFITS • Forged, integral trigger guard offers the optimal space needed for gloved fi ngers. • Chromed fi ring pin for extended life. • Armornite® fi nish on barrel - a durable, corrosion - resistant fi nish for longer life. • Magpul® MBUS® folding rear sight. • 6-Position collapsible stock to accommodate various shooter sizes. • 30 round Magpul® PMAG® or 10 round magazine. • M4 feed ramps for reliable feeding. • Compatible with most standard AR15 components and accessories. Here's S&W FULL Product Catalog with Specs --Page 20 and 21 are the only models with M4 Ramps--- http://www.swgear.com/goodies/uploads/2016/07/2016-SW-Catalog.pdf