The Sidewinder 2 is the next evolution of our Sidewinder back-up iron sights. After receiving feedback from competition shooters and military personnel in the field, the sights have been upgraded to easily handle not only 5.56 but larger calibers as well as harsher environments. Keeping our same design concept, the Sidewinders offer the on the go option for 45 degree offset or traditional in line capabilities all in one package. Tool-less adjustment dials allow easy sight adjustments. Whether you need a low profile, low snag inline backup for your red dot or a short range, offset CQB sight backup for magnified optics, the Sidewinder can fill your needs. The low-profile SI-Ambush mounting system can clear even the largest of optics and the offset sight means instant access to your back up iron sights without removing your optic. Do not exceed 15 in/lbs (1.69 nM) for the Picatinny mount screws. Sight adjustment based on system length 0.50 MOA for 14.5" sight radius, 0.30 MOA for 20" sight radius. Rear apertures sizes 1.38 mm for small, 3.5mm for large.