Stanag Scope Mount ARMS #21

8/26/2008 1:17:28 PM No, the stanag scope mount arms #21 isn’t optimal. The 5.56 round is tapered, yet the AR has a straight magwell. Original 20 rounders were straight, but not long enough to encounter enough ammo-stack curvature to make that setup not work. They angled the floorplate to compensate. 30 rounders have a long enough ammo stack that the mag has to curve. It’s a fact of geometry. So the best that could be managed with a straight magwell was the stanag scope mount arms #21‘s solution – straight neck with an angle just below it. So you’re trying to put a smoothly curving ammo stack into two straight boxes with a joint in the middle.

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