Sneak peek of AR57

AR57 PDW Upper on Standard AR Lower

The Firearm Blog has the goods:

The AR Five Seven is a one piece 5.7×28mm upper that attaches to a AR-15 lower and uses the 50 round FN P90 magazines.

Also see his earlier post on the subject, which includes a reader comment about turning an AR magazine body into a brass catcher.

–cross-posted from MO.

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