LMC pre-production is a short run of LMC (Low profile, duty, Magazine Catch). Instead of the shortened shaft and taller"bump" on the magazine plate (the part that engages the magazine's cut out), Auguest production LMC pre-production uses the shorter shaft shaft length but TDP spec bump height.
Billet machined in 4140 steel and black nitrided, LMC pre-production is shipped with a 10.9in/lb magazine catch spring. The 10.9 inch/lb magazine catch spring was first introduced in 2017, we had stiffer springs custom made for our EMR-A (ambidextrous magazine catch). The 10.9 in/lb spring's role is to offset the mechanical advantage afforded by EMR-A's lever, it also has the direct result of making the right side magazine release button harder to press, which we view as a positive. For more info on the 10.9in/lb magazine catch springs, please visit this page: https://www.forwardcontrolsdesign.com/109lbin-Mag-Catch-Springs_p_79.html
Proudly designed and made in the USA.
For 308 AR users, AR15/M16 spec magazine catches work best with taller magazine release buttons, such as the EMR-HC and EMR-HC, AA. The taller profile accommodates the thicker 308 AR receivers. EMR-HC and EMR-HC, AA will still stay flush or below the magazine release fence on the right side of the lower receiver.