Apply coupon "DUT" for $5 Shipping over $125 - Brownell's has a sale on their Tangodown ARC magazines. The ARC magazine has a reinforced polymer body with unparalleled crush- and impact resistance, plus the latest features to ensure outstanding reliability. The top half of the two-piece body has straight walls and the optimal angle for reliable feeding, with a constant-radius curve in the lower half to aid in stable movement of the round stack. Molded-in reinforcing ridges, four interlocking tabs, and advanced, industrial-strength adhesive ensure that the joint between the halves is the strongest part of the body. Without a separate floorplate or lengthwise welded seam, the body forms an ultra-rigid, five-sided box that won’t fail when dropped free on hard pavement. Sealed body keeps out dirt, dust, and moisture; if necessary, clean the inside by blowing compressed air or water through relief holes in the follower. Proprietary anti-tilt follower of self-lubricating polymer rides smoothly in slots to ensure reliable, snag-free ammo flow. Premium-grade chrome-silicon steel spring is heat-treated to relieve stress and moly-coated for corrosion resistance and smooth movement; fully tested to ensure retention of spring force through 100,000 compression cycles. Reinforced feed lips stand up to the battering of sustained full-auto fire. Deep serrations on the front and rear of the body, plus an aggressive waffle pattern on the sides, give a non-slip grasp. Available in straight-body 20-round or curved-body 30-round capacity.