11b4vGeneration 1.5 PMAG, produced in 2009. Gen 1 production ended in 2008 and M2 production started in 2009. There's narrow window of time where these were produced. Interesting features that differ from Gen 2/3: Marked "PATENT PENDING" Marked "BOULDER CO USA - CAGE 1LX50" Black followers and lock plate No number markings for round count Five finger grip sections instead of four Plastic windows feature distinctive 3 dimples like Gen 1's ODG Cover is possible later, Gen 2. $55 shipped/insured.
