SureFire Institute has just introduced their new Polymer lower receiver for AR-style rifles.
Developed in conjunction with E3 Arms, they took a look at the internal firing mechanism to improve trigger pull and reset. However, the selector lever can be moved to Safe with the hammer forward or to the rear. The SFI-15 can be stored on Safe no matter what condition the rifle is in, and the weapon can immediately be placed on Safe while dealing with a malfunction.
It weighs 1.1 lbs. I realize many are hesitant to use a polymer lower but SFI says that the material has a tensile strength of 33,500 psi, tensile elongation of 2.5-3.5% and flexural strength of 50,000 psi.
